View Compilation Error

279123_0_1012.c: In function `main':
279123_0_1012.c:3: error: `__int64' undeclared (first use in this function)
279123_0_1012.c:3: error: (Each undeclared identifier is reported only once
279123_0_1012.c:3: error: for each function it appears in.)
279123_0_1012.c:3: error: syntax error before "m"
279123_0_1012.c:4: error: `m' undeclared (first use in this function)
279123_0_1012.c:4: error: `n' undeclared (first use in this function)