0_0_12101872_4262.cpp:3: error: `main' must return `int'
0_0_12101872_4262.cpp: In function `int main(...)':
0_0_12101872_4262.cpp:5: error: `scanf' undeclared (first use this function)
0_0_12101872_4262.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_12101872_4262.cpp:15: error: `printf' undeclared (first use this function)
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