#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep1(i,n) for(int i=1;i<=(int)(n);i++)
#define all(c) c.begin(),c.end()
#define pb push_back
#define fs first
#define sc second
#define show(x) cout << #x << " = " << x << endl
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
using namespace std;
int H,W;
bool solve(){
	cin>>H>>W;
	if(H>W) swap(H,W);
	if(H==1) return W==2;
	if(H*W%2) return 0;
	return 1;
}
int main(){
	if(solve()) puts("YES");
	else puts("NO");
}