205080_0_28982.cpp:2:15: math: No such file or directory
205080_0_28982.cpp: In function `int isprime(int)':
205080_0_28982.cpp:6: error: `sqrt' undeclared (first use this function)
205080_0_28982.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
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