View Compilation Error

0_0_2495372_802.cpp:3: error: `_int64' does not name a type
0_0_2495372_802.cpp:5: error: `_int64' does not name a type
0_0_2495372_802.cpp: In function `int main()':
0_0_2495372_802.cpp:13: error: `m' undeclared (first use this function)
0_0_2495372_802.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2495372_802.cpp:22: error: `_int64' undeclared (first use this function)
0_0_2495372_802.cpp:22: error: expected `;' before "end"
0_0_2495372_802.cpp:25: error: `end' undeclared (first use this function)
0_0_2495372_802.cpp:39: error: `a' undeclared (first use this function)
0_0_2495372_802.cpp:40: error: expected `;' before "sum"
0_0_2495372_802.cpp:41: error: `i' undeclared (first use this function)
0_0_2495372_802.cpp:44: error: `sum' undeclared (first use this function)