View Compilation Error

0_0_9130078_6559.cpp:7: error: `_int64' does not name a type
0_0_9130078_6559.cpp: In function `int main()':
0_0_9130078_6559.cpp:57: error: `res' undeclared (first use this function)
0_0_9130078_6559.cpp:57: error: (Each undeclared identifier is reported only once for each function it appears in.)