#include <stdio.h>
int main(void) {
int a,b,c;
scanf("%d %d %d" , &a
, &b
, &c
); if (c==(a-b) || c==(b-a) || a==(c-b) || a ==(b-c) || b==(a-c) || b==(c-a) )
{
}
else {
}
return 0;
}
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