#include #include using namespace std;

int main() { int a,b,c; cin>>a>>b>>c; if (a>0 and b>0 and c>0 and a+b>c and b+c>a and a+c>b){ if (aa +bbcc or bb +c*caa or bb==aa+cc){ cout <<"Yes!"; } else{ cout <<"No!"; } } else{ cout <<"Error!"; } return 0; }