View Compilation Error

0_0_8880403_19894.cpp: In function `int main()':
0_0_8880403_19894.cpp:15: error: `_int64' undeclared (first use this function)
0_0_8880403_19894.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8880403_19894.cpp:15: error: expected `;' before "n"
0_0_8880403_19894.cpp:16: error: `n' undeclared (first use this function)