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

int main()
{
    long long A, B;
    cin >> A >> B;
    if (A == B)
    {
        cout << "Yes";
        return 0;
    }
    if (A > B)
    {
        swap(A, B);
    }
    if (A == 2 && B == 4)
    {
        cout << "Yes";
    }
    else
    {
        cout << "No";
    }
}