#include <cstdio>
#include <cmath>
#include <cstring>
#include <cctype>
#include <cstdlib>
#include <climits>
#include <vector>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <list>
#include <algorithm>
#include <string>

using namespace std;

#define FOR(i,m,n) for (int i = m; i < n; i++)
#define EPS (1E-8)

int main() {
  int x, y, n;
  long double r, curr; long double rr; 
  while(1) {
    scanf("%d%d%d%Lf", &x, &y, &n, &rr);
    r = rr; 
    if (x == 0 && y == 0 && n == 0 && r == 0) break;
    curr = x;
    r = 1 + r / 1200.0;
   
    long double rm = 1.;
    long double r2 = 1./r;
    
    for(int i=1;i<200000;i*=2){
      if((12*n)&i)
        rm*=r2;
      r2*=r2;
    }
    
    
    long double s = ((long double)x/(1.-rm))*(r-1.);
    //printf("%Lf\n",s);
  
    if (s > (long double)y) {
        printf("NO\n");
    }
    else {
      printf("YES\n");
    }
  }
  
  return 0;
}
/*for (int m = 0; m < 12; m++) {
        curr *= (1 + r / 12 / 100);
        curr -= y;
        if (curr <= EPS) {
          printf("YES\n");
          b = 1;
          break;
}
}*/