diff --git a/project_euler/p016_PowerDigitSum.py b/project_euler/p016_PowerDigitSum.py
index c1118d1..258e7ff 100644
--- a/project_euler/p016_PowerDigitSum.py
+++ b/project_euler/p016_PowerDigitSum.py
@@ -1,30 +1,23 @@
-/* Check cf5-opt.vim defs.
-VIM: let g:lcppflags="-std=c++11 -O2 -pthread"
-VIM: let g:wcppflags="/O2 /EHsc /DWIN32"
-VIM: let g:argv=""
-VIM-: let g:cf5output=0
-*/
-#include <iostream>
-#include <exception>
+#Power digit sum
+#Problem 16
+#
+#215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
+#
+#What is the sum of the digits of the number 21000?
 
-/*
-*/
 
-int main ( void )
-{try{
+pp = 1000
 
-	return 0;
-}
-catch ( const std::exception& e )
-{
-	std::cerr << std::endl
-			<< "std::exception(\"" << e.what() << "\")." << std::endl;
-	return 2;
-}
-catch ( ... )
-{
-	std::cerr  << std::endl
-			<< "unknown exception." << std::endl;
-	return 1;
-}}
+c = [0 for i in range(0, pp//3+1)]
+c[0] = 1
 
+for i in range(0,pp):
+    r = 0
+    for j in range(0,len(c)):
+        p = c[j]*2+r
+        r = p//10
+        c[j] = p%10
+s = 0
+for i in c:
+    s += i
+print( s )