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

int main()
{
	long long X, A, Y, B;
	cin >> X >> A >> Y >> B;

	map<long long, int> mpx;
	for( long long i = 2; i * i <= X; i++ ) {
		while( X % i == 0 ) {
			mpx[i]++;
			X /= i;
		}
	}
	if( X != 1 ) mpx[X]++;
	map<long long, int> mpy;
	for( long long i = 2; i * i <= Y; i++ ) {
		while( Y % i == 0 ) {
			mpy[i]++;
			Y /= i;
		}
	}
	if( Y != 1 ) mpy[Y]++;
	string ans = "Yes";
	for( auto it = mpy.begin(); it != mpy.end(); it++ ) {
		long long f = it->first;
		__int128 s = it->second;
		__int128 xs = mpx[f];
		if( s * B > xs * A ) ans = "No";
		if( ans == "No") break;
	}

	cout << ans << endl;
}