diff --git a/C#/1.Multiples_of_3_and_5/arya-prof.cs b/C#/1.Multiples_of_3_and_5/arya-prof.cs
deleted file mode 100644
index e5b813c..0000000
--- a/C#/1.Multiples_of_3_and_5/arya-prof.cs
+++ /dev/null
@@ -1,25 +0,0 @@
-// Euler 1
-using System;
-
-namespace _5_multiples
-{
-    public class MainClass
-    {
-        public static void Main()
-        {
-            int currentNumber = 1000;
-            int allSum = 0;
-
-            currentNumber = currentNumber - 1;
-            while (currentNumber > 0)
-            {
-                if ( (currentNumber % 3 == 0) | (currentNumber % 5 == 0))
-                {
-                    allSum = allSum + currentNumber;
-                }
-                currentNumber = currentNumber - 1;
-            }
-            Console.WriteLine(allSum);
-        }
-    }
-}
diff --git a/Python/39. Integer right triangles/kohzhixin.py b/Python/39. Integer right triangles/kohzhixin.py
new file mode 100644
index 0000000..73f2e5c
--- /dev/null
+++ b/Python/39. Integer right triangles/kohzhixin.py	
@@ -0,0 +1,16 @@
+"""
+Problem 39
+"""
+
+def solution(max_p):
+    max_num = 0
+    for p in range(0, max_p, 2):
+        c = 0
+        for a in range(2, int(p/3)):
+            if (p**2 - 2*p*a) % (2 * (p-a)) == 0:
+                c += 1
+        if c > max_num:
+            max_num = c
+    return max_num
+
+print(solution(1000))
\ No newline at end of file
diff --git a/Python/43. Sub-string divisibility/kohzhixin.py b/Python/43. Sub-string divisibility/kohzhixin.py
new file mode 100644
index 0000000..96de1e4
--- /dev/null
+++ b/Python/43. Sub-string divisibility/kohzhixin.py	
@@ -0,0 +1,24 @@
+"""
+Problem 43
+"""
+
+from itertools import permutations
+
+div = [2, 3, 5, 7, 11, 13, 17]
+
+def solution():
+    total = 0
+    for i in list(permutations([j for j in range(10)])):
+        if check_num(i):
+            total += int("".join([str(n) for n in i]))
+    return total
+
+def check_num(i):
+    for j in range(len(div)):
+        num = i[j+1] * 100 + i[j+2] * 10 + i[j+3]
+        if num % div[j] != 0:
+            return False
+    return True       
+
+
+print(solution())
\ No newline at end of file
diff --git a/README.md b/README.md
index ab26076..9ebcac9 100644
--- a/README.md
+++ b/README.md
@@ -68,11 +68,11 @@ Happy Contributing! 😃
 | 36 | [Double-base palindromes](https://projecteuler.net/problem=36)               |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |
 | 37 | [Truncatable primes](https://projecteuler.net/problem=37)                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |
 | 38 | [Pandigital multiples](https://projecteuler.net/problem=38)                  |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |
-| 39 | [Integer right triangles](https://projecteuler.net/problem=39)               | :white_check_mark: | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |
+| 39 | [Integer right triangles](https://projecteuler.net/problem=39)               | :white_check_mark: | :white_check_mark: |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 40 | [Champernowne's constant](https://projecteuler.net/problem=40)               |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 41 | [Pandigital prime](https://projecteuler.net/problem=41)                      |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 42 | [Coded triangle numbers](https://projecteuler.net/problem=42)                |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
-| 43 | [Sub-string divisibility](https://projecteuler.net/problem=43)               |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |                    |
+| 43 | [Sub-string divisibility](https://projecteuler.net/problem=43)               |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 44 | [Pentagon numbers](https://projecteuler.net/problem=44)                      |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 45 | [Triangular, pentagonal, and hexagonal](https://projecteuler.net/problem=45) |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 46 | [Goldbach's other conjecture](https://projecteuler.net/problem=46)           |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
@@ -81,9 +81,9 @@ Happy Contributing! 😃
 | 49 | [Prime permutations](https://projecteuler.net/problem=49)                    |                    |                    |                    | :white_check_mark: |                    |                    |                    |                    |                    |                    |                    |                    |
 | 50 | [Consecutive prime sum](https://projecteuler.net/problem=50)                 |                    |                    |                    | :white_check_mark: |                    |                    | :white_check_mark: |                    | :white_check_mark: |                    |                    |                    |
 
-
 ## Thanks
 
+
 - Thanks to you all who are doing their best in solving the problems, we appriciate your efforts.
 - We thank you all for the overwelming P.R that we have recieved, To mantain the quality and response of the P.R we have updated the
 [guidelines](#How-to-contribute).