#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    int a[3];
    for(int i = 0; i < 3; i++)cin>>a[i];
    sort(a, a+3);
    if(a[0] == a[1] && a[1] != a[2])cout<<"YES";
    else cout<<"NO";
    return 0;
}
