#include<bits/stdc++.h>
using namespace std;

int main(){
  using ll=long long;
  ll n,p;
  cin>>n>>p;
  if (p==2){
    if ((n+1)%2==0) cout<<"Yes\n";
    else cout<<"No\n";
  }
  else{
    if ((n+1)%p==0||(p-1)%(n+1)==0) cout<<"Yes\n";
    else cout<<"No\n";
  }
}