diff --git a/main.py b/main.py
index 7f4f555..1a679d4 100644
--- a/main.py
+++ b/main.py
@@ -5,12 +5,26 @@
 
 
 def to_binary(n: int)->str:
-    pass
+    answer = ""
+    while n:
+        answer =str( n % 2) + answer
+        n //= 2
+    return answer
+
+
+
 
 
 
 # Press the green button in the gutter to run the script.
 if __name__ == '__main__':
-    to_binary(12)
+    assert to_binary(5) == "101"
+    assert to_binary(1) == "1"
+    assert to_binary(8) == "1000"
+    assert to_binary(15) == "1111"
+    print(to_binary(5))
+    print(to_binary(1))
+    print(to_binary(8))
+    print(to_binary(15))
 
 # See PyCharm help at https://www.jetbrains.com/help/pycharm/