#include <stdio.h>

int main(void) {
	int splatka, roky, i;
	double castka, urok, mUrok, nasobeni;
        bool printed = false;
        double minula;

	do {
                printed = false;
		scanf("%lf %d %d %lf", &castka, &splatka, &roky, &urok);
                
                if (castka == 0 && splatka == 0 && roky == 0) {
                    printed = true;
                    return 0;
                }
                
		if ((roky * 12 * splatka) < castka) {
			printf("NO\n");
                        printed = true;
			continue;
		}
                  
                
                mUrok = urok / 12 /100;
                nasobeni = mUrok + 1;
                
                minula = castka;
                
                for (i = 1; i <= roky*12 ; i++) {
                    minula = castka;
                    castka *= nasobeni;
                    castka -= splatka;
                  
                    if (castka > minula) {
                        printf("NO\n");
                        printed = true;
			break;
                    }
                    
                    if (((roky*12 - i)*splatka) < castka) {
			printf("NO\n");
                        printed = true;
			break;
                    } 
                    
                }
                
                if (printed == false) {
                    if (castka <= 0) {
                        printf("YES\n");
                    } else {
                        printf("NO\n");
                    }
                } 
                                

	} while (1);

	return 0;
}