View Compilation Error

0_0_6421737_30982.cpp: In function `int main()':
0_0_6421737_30982.cpp:5: error: `_int64' undeclared (first use this function)
0_0_6421737_30982.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6421737_30982.cpp:5: error: expected `;' before "n"
0_0_6421737_30982.cpp:14: error: `n' undeclared (first use this function)