View Compilation Error

0_0_32612173_5624.cpp: In function 'int main()':
0_0_32612173_5624.cpp:13:9: error: '_int64' was not declared in this scope
         _int64 sum = 0;
         ^
0_0_32612173_5624.cpp:19:13: error: 'sum' was not declared in this scope
             sum += x;
             ^
0_0_32612173_5624.cpp:23:13: error: 'sum' was not declared in this scope
         if (sum - ma < ma - 1)
             ^