View Compilation Error

0_0_14791468_12032.cpp: In function 'int main()':
0_0_14791468_12032.cpp:12:13: error: expected initializer before 'sum'
  int _int64 sum;
             ^
0_0_14791468_12032.cpp:20:3: error: 'sum' was not declared in this scope
   sum = 0;
   ^