#include<iostream>
using namespace std;
long X,A,Y,B;
bool ok=true;
void f(long p)
{
	long c=0;
	while(Y%p==0)Y/=p,c+=B;
	while(X%p==0)X/=p,c-=A;
	if(c>0)ok=false;
}
main()
{
	cin>>X>>A>>Y>>B;
	for(long p=2;p*p<=Y;p++)if(Y%p==0)f(p);
	if(Y>1)f(Y);
	cout<<(ok?"Yes":"No")<<endl;
}