#include<bits/stdc++.h>
using namespace std;
int main() {
	double a, b, c;
	cin >> a >> b >> c;
	const double EPS = 1e-6;
	if (abs(a - (b+c))<=EPS)cout << "YES";
	else cout << "NO";
	return 0;
}//}-32.683102 
//5.789956
//-38.473058