#include <iostream>
int main(){
int a,b,c;
std::cin >> a;
std::cin >> b;
std::cin >> c;
if(a+b > c){
std::cout << "UNDEFINED" << "\n";
}
else if (a*a+b*b >= c*c){
std::cout << "YES" << "\n";
}
else{
std::cout << "NO" << "\n";
}
}
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