View Compilation Error

0_0_30053761_7022.cpp: In function 'int main()':
0_0_30053761_7022.cpp:5:2: error: '_int64' was not declared in this scope
  _int64 ans;
  ^
0_0_30053761_7022.cpp:12:3: error: 'ans' was not declared in this scope
   ans = 0;
   ^