#include<iostream>
#include<iomanip>
#include<string>
#include<algorithm>
#include<vector>
#include<set>
#include<list>
#include<queue>
#include<math.h>
#include<bitset>
using ll = long long;
using namespace std;

int main(){
    ll n, m, c;
    cin >> n >> m;
    cout << (((n%2) && (m%2)) ? "NO" : "YES") << endl;
}