#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  double l, m, r;
  while (cin >> n >> l >> m >> r) {
    double a[105];
    double sum[105];
    sum[0] = 0;
    for (int i = 1; i <= n; i++) {
      cin >> a[i];
      sum[i] = sum[i - 1] + a[i];
    }
    bool ft = 0;
    for (int i = 1; i <= n; i++) {
      double LL, LR, RL, RR;
      LL = sum[i] * r;
      LR = sum[i] * l / 2;
      RL = (sum[n] - sum[i]) * r;
      RR = (sum[n] - sum[i]) * l / 2;
      if (RR >= LR && RL <= LR) {
        ft = 1;
        break;
      } else if (LR >= RR && LL <= RR) {
        ft = 1;
        break;
      } else if (RR >= LL && LL >= RL) {
        ft = 1;
        break;
      } else if (LR >= RL && RL >= LL) {
        ft = 1;
        break;
      } else if (LL > RR) {
        if (LL - RR <= m) {
          ft = 1;
          break;
        }
      }
      if (RL > LR) {
        if (RL - LR <= m) {
          ft = 1;
          break;
        }
      }
    }
    if (ft)
      printf("Yes\n");
    else
      printf("No\n");
  }
}
