View Compilation Error

0_0_34656038_5410.cpp: In function 'int main()':
0_0_34656038_5410.cpp:38:6: error: redeclaration of 'int sum'
  int sum;
      ^
0_0_34656038_5410.cpp:19:6: note: 'int sum' previously declared here
  int sum;
      ^