#include<bits/stdc++.h>
using lint=long long;
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(15);
    lint n,m,_;std::cin>>n>>m>>_;
    std::cout<<(m==1&&m==1||1<n&&1<m&&(n%2==0||m%2==0)?"YES":"NO")<<'\n';
}