题解

自己思考一下哪几种情况即可

#include<bits/stdc++.h>
using namespace std;

int a,b,c;

int main()
{
	cin >> a >> b >> c;
    if((a == 1 && b == 2) || (a == 1 && c == 3) || (b == 2 && c == 3))
    {
        cout << "YES" << "\n";
    }
    else
    {
        cout << "NO" << "\n";
    }
	return 0;
}