View Compilation Error

0_0_37602340_21995.cpp: In function 'int main()':
0_0_37602340_21995.cpp:13:9: error: '_int64' was not declared in this scope
         _int64 ans=0;
         ^
0_0_37602340_21995.cpp:16:13: error: 'ans' was not declared in this scope
             ans+=num/5;
             ^
0_0_37602340_21995.cpp:19:26: error: 'ans' was not declared in this scope
         printf("%I64d\n",ans);
                          ^