View Compilation Error

0_0_4988389_4338.cpp:1: error: expected constructor, destructor, or type conversion before '<' token
0_0_4988389_4338.cpp:1: error: expected `,' or `;' before '<' token
0_0_4988389_4338.cpp:5: error: `__int64' does not name a type
0_0_4988389_4338.cpp: In function `int main()':
0_0_4988389_4338.cpp:18: error: `__int64' undeclared (first use this function)
0_0_4988389_4338.cpp:18: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4988389_4338.cpp:18: error: expected `;' before "n"
0_0_4988389_4338.cpp:19: error: `n' undeclared (first use this function)
0_0_4988389_4338.cpp:19: error: `scanf' undeclared (first use this function)
0_0_4988389_4338.cpp:20: error: `ans' undeclared (first use this function)
0_0_4988389_4338.cpp:21: error: `phi' undeclared (first use this function)
0_0_4988389_4338.cpp:22: error: `printf' undeclared (first use this function)