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