View Compilation Error

0_0_17521165_26723.cpp: In function 'int main()':
0_0_17521165_26723.cpp:6:8: error: '_int64' was not declared in this scope
        _int64 t,n;
        ^
0_0_17521165_26723.cpp:8:10: error: 't' was not declared in this scope
     cin>>t;
          ^
0_0_17521165_26723.cpp:10:11: error: 'n' was not declared in this scope
      cin>>n;
           ^
0_0_17521165_26723.cpp:11:19: error: expected ';' before 'sum'
            _int64 sum=pow(pow(2,0.5)+pow(3,0.5),2*n);
                   ^
0_0_17521165_26723.cpp:12:6: error: 'sum' was not declared in this scope
      sum%=1024;
      ^