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