//
// File:   mortgage.cc
// Author: cteam044
//
// Created on October 22, 2011, 3:34 PM
//

#include <cstdlib>
#include <cmath>
#include <cmath>
#include <cstdio>
//
//
//
double EPS = 10e-8;
int main(int argc, char** argv) {
    double X, Y, r, g;
    int N;
    while (1) {
        start:
        scanf("%lf %lf %d %lf", &X, &Y, &N, &r);
        
        g = 1+ ( r / 100 ) / 12;
        //printf("%f %f %d %f\n", X, Y, N, g);
        if (X==0) break;
        for(int i = 0; i < N; i++)
            for(int j = 0; j < 12; j++) {
                
                //printf("%f * %f - %f = %f\n", X, g, Y, X * g  - Y );
                X = X * g  - Y;
                
                //printf("%f\n", X);
                
                if(X < EPS)
                {printf("YES\n");
                
                 goto start;}
            }
        printf("NO\n");
    }
    return (0);
}