import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        HashMap<Long, Integer> xCon = getMap(sc.nextLong());
        long a = sc.nextLong();
        HashMap<Long, Integer> yCon = getMap(sc.nextLong());
        long b = sc.nextLong();
        for (long x : yCon.keySet()) {
            if (yCon.get(x) * b > xCon.getOrDefault(x, 0) * a) {
                System.out.println("No");
                return;
            }
        }
        System.out.println("Yes");
    }
    
    static HashMap<Long, Integer> getMap(long x) {
        HashMap<Long, Integer> ret = new HashMap<>();
        for (long i = 2; i <= Math.sqrt(x); i++) {
            while (x % i == 0) {
                ret.put(i, ret.getOrDefault(i, 0) + 1);
                x /= i;
            }
        }
        if (x > 1) {
            ret.put(x, ret.getOrDefault(x, 0) + 1);
        }
        return ret;
    }
}
    
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}