View Compilation Error

0_0_37417831_28037.cpp: In function 'int main()':
0_0_37417831_28037.cpp:4:3: error: 'int64' was not declared in this scope
   int64 f,sum;
   ^
0_0_37417831_28037.cpp:9:3: error: 'sum' was not declared in this scope
   sum=0;
   ^
0_0_37417831_28037.cpp:10:18: error: 'f' was not declared in this scope
   scanf("%I64d",&f);
                  ^