#include <stdio.h>
#include <stdlib.h>

int main()
{
    long long int  X = 1,Y = 1;
    int N = 1;
    long double r = 1, p;

    while (X!=0 && Y != 0 && N!= 0 && r!= 0 ){
    scanf("%lld %lld %d %Lf", &X, &Y, &N, &r);
    p = (X/100.0)*r;
    p = p + X;



    if (p > (Y*(12*N)))
    {
      printf("NO\n");

    }
    else printf("YES\n");
    }

     return 0;
}