69880_0_11453.cpp: In function `int main()':
69880_0_11453.cpp:11: error: `_int64' undeclared (first use this function)
69880_0_11453.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
69880_0_11453.cpp:11: error: expected `;' before "sum"
69880_0_11453.cpp:18: error: `sum' undeclared (first use this function)
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