View Compilation Error

186564_0_7306.cpp: In function `int main()':
186564_0_7306.cpp:5: error: `int64' undeclared (first use this function)
186564_0_7306.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
186564_0_7306.cpp:5: error: expected `;' before "sum"
186564_0_7306.cpp:6: error: `m' undeclared (first use this function)
186564_0_7306.cpp:9: error: `n' undeclared (first use this function)
186564_0_7306.cpp:10: error: `sum' undeclared (first use this function)