#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c;
	cin>>a>>b>>c;
	if(a*a+b*b==c*c){
		cout<<a*b/c;
	}
	else if(a*a+c*c==b*b){
		cout<<a*c/b;
	}
	else if(c*c+b*b==a*a){
		cout<<c*b/a;
	}
	else{
		cout<<"no";
	}
	return 0;
}