#include <bits/stdc++.h>
using namespace std;
int main()
{
long long x,t;
cin>>x>>t;
long long area=0.5*x*t;
long long sqt=sqrt(area);
int flag=1;
if (area==0||area==1||area<1){
cout<<"NO"<<endl;
return 0;
}
for (long long i=2;i<=sqt;i++){
if (area%2==0){
flag=0;
}
}
if (flag==0) cout<<"NO";
else if (flag==1) cout<<"YES";
return 0;
}
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