Update sol6.py

Author: poyea

project_euler/problem_01/sol6.py

@@ -1,8 +1,9 @@
 a=3
 result=0
-while a<=1000:
-  if(a%3==0 and a%5==0):
-    result+=a
-  elif(a%15==0):
-    result-=a
+while a<1000:
+    if(a%3==0 or a%5==0):
+        result+=a
+    elif(a%15==0):
+        result-=a
+    a+=1
 print(result)