import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

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