0_0_2797976_28974.cpp: In function `int main()':
0_0_2797976_28974.cpp:13: error: `_int64' undeclared (first use this function)
0_0_2797976_28974.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2797976_28974.cpp:13: error: expected `;' before "Sum"
0_0_2797976_28974.cpp:15: error: `Sum' undeclared (first use this function)
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