View Compilation Error

0_0_11142956_26999.cpp: In function `int main()':
0_0_11142956_26999.cpp:29: error: `__int64_t' undeclared (first use this function)
0_0_11142956_26999.cpp:29: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11142956_26999.cpp:29: error: expected `;' before "res"
0_0_11142956_26999.cpp:33: error: `res' undeclared (first use this function)