import java.util.*;

public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        long X = sc.nextLong();
        long A = sc.nextLong();
        long Y = sc.nextLong();
        long B = sc.nextLong();
        boolean ok = true;
        for( long i = 2; i*i <= X; i++ ) {
            if( X%i != 0 && Y%i == 0 ) ok = false;
            if( X%i == 0 && Y%i == 0 ) {
                int xcnt = 0;
                while( X%i == 0 ) {
                    xcnt++;
                    X /= i;
                }
                int ycnt = 0;
                while( Y%i == 0 ) {
                    ycnt++;
                    Y /= i;
                }
                if( xcnt*A < ycnt*B ) ok = false;
            }
        }
        
        if( X > 1 && X != Y ) ok = false;
        System.out.println( ok ? "Yes" : "No" );
        
    }
    
}