#include<iostream>
#include<cmath>
using namespace std;
long long a,b,gsa=0,gsb=0;
int main()
{
	cin>>a>>b;
	for(int i=1; i<a; i++)
	{
		if(a%i==0) gsa+=i;
	} 
	for(int i=1; i<b; i++)
	{
		if(b%i==0) gsb+=i;
	}
	if(gsa==b && gsb==a) cout<<"yes";
	else cout<<"no";
	return 0;
} 
/**************************************************************
	Problem: 1862
	User: admin
	Language: C++
	Result: Accepted
	Time:48 ms
	Memory:2072 kb
****************************************************************/