#include <iostream>
#include <stdio.h>
#include <math.h>
using namespace std;
int main()
{
long long a,b,c,d;
cin>>a>>b>>c>>d;
if (pow(a,b)>pow(c,d))
{
cout<<"YES"<<endl;
}
else if(pow(a,b)<=pow(c,d))
{
cout<<"NO"<<endl;
}
return 0;
}
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