#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  //e
  long long k, l, r, t, x, y;
  cin >> k >> l >> r >> t >> x >> y;
  k -= l;
  r -= l;
  if (y >= x) {
    long long itr = 0;
    long long cur = k;
    long long cnt = 0;
    for (; itr < x * 2; itr++) {
      cnt += cur / x;
      cur %= x;
      if (cur + y > r) break;
      cur += y;
    }
    if (cnt >= t || itr == x * 2) {
      cout << "Yes\n";
    } else {
      cout << "No\n";
    }
  } else {
    long long cur = k;
    long long ans = 0;
    if (cur + y <= r) {
      cur += y;
      cur -= y;
      ans++;
    } else {
      if (cur >= x) {
        cur -= x;
        ans++;
      }
    }
    ans += cur / (x - y);
    cout << (ans >= t ? "Yes\n" : "No\n");
  }
  return 0;
}