#include <bits/stdc++.h>
using namespace std;
int main() {
  int x, t, a, b, at, bt;
  cin >> x >> t >> a >> b >> at >> bt;
  int btek = b;
  set<int> my;
  my.insert(0);
  int ttek1 = t;
  while (btek > 0 && ttek1 > 0) {
    my.insert(btek);
    int atek = a;
    int ttek2 = t;
    while (atek > 0 && ttek2 > 0) {
      my.insert(atek);
      my.insert(atek + btek);
      ttek2--;
      atek -= at;
    }
    ttek1--;
    btek -= bt;
  }
  if (my.find(x) != my.end())
    cout << "YES";
  else
    cout << "NO";
}
