View Compilation Error

0_0_38279194_19691.cpp: In function 'int main()':
0_0_38279194_19691.cpp:7:5: error: '_int64' was not declared in this scope
     _int64 sum,n;
     ^
0_0_38279194_19691.cpp:9:16: error: 'n' was not declared in this scope
     while(cin>>n)
                ^
0_0_38279194_19691.cpp:11:9: error: 'sum' was not declared in this scope
         sum=0;
         ^
0_0_38279194_19691.cpp:32:1: error: expected '}' at end of input
 }
 ^