#include<bits/stdc++.h>
using namespace std;
int main()
{
    int m,n,t1=0,t2=0;
    cin>>m>>n;
    for(int j=1;j<=m;j++){
        if(m%j==0)  t1+=j;
    }
    for(int j=1;j<=n;j++){
        if(n%j==0)  t2+=j;
    }
    if(t1==t2&&t1==m+n+1)  cout<<"Yes";
    else{  cout<<"No";  }
}