#include <stdio.h>

int main(void)
{
    int N, M;
    scanf("%d%d", &N, &M);
    if (N * M % 2) puts("NO");
    else if (N == 1 || M == 1) {
        if (N == 2 || M == 2) puts("YES");
        else puts("NO");
    }
    else puts("YES");
    return 0;
}