Problem 19

#include<iostream>
using namespace std;
int main()
{
    int a,b,c,d;
    while(cin>>a>>b>>c)
    {
        if(a>b)
        {
            d=a;
            a=b;
            b=d;
        }
        if(a>c)
        {
            d=a;
            a=c;
            c=d;
        }
        if(b>c)
        {
            d=b;
            b=c;
            c=d;
        }
        if(a>3)
        {
            cout<<"NO"<<endl;
            continue;
        }
        if(a==3)
        {
            if(b==3&&c==3)
            {
                cout<<"YES"<<endl;
            }
            else cout<<"NO"<<endl;
            continue;
        }
        if(a==2)
        {
            if(b==2)
                cout<<"YES"<<endl;
            else if(b==4&&c==4)
                cout<<"YES"<<endl;
            else cout<<"NO"<<endl;
            continue;
        }
        if(a==1)
        {
            cout<<"YES"<<endl;
            continue;
        }

    }
}