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#include<stdio.h>
int main() {
	double h;
	while(scanf("%lf",&h),h) {
		double u,d,f;
		scanf("%lf %lf %lf",&u,&d,&f);
		int cnt=1;
		double t=0;
		f=f/100.0*u;
		while(1) {
			t+=u;
			if(t>h)
				break;
			t-=d;
			if(t<0)
				break;
			u-=f;
			cnt++;
		}
		if(t<0)
			printf("failure on day %d\n",cnt);
		else
			printf("success on day %d\n",cnt);
	}
	return 0;
}