#include <bits/stdc++.h>
using namespace std;
long long bin_pow(long long a, long long b) {
  if (b == 0) return 1;
  if (b % 2 == 0) {
    long long t = bin_pow(a, b / 2);
    return t * t % 1000000007;
  } else
    return a * bin_pow(a, b - 1) % 1000000007;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  long long t = 1, n, m, k = 0, x = 0, y = 0, z = 0, sum = 0, l = 0, r = 0,
            ans = 0, mn = LLONG_MAX, mx = LLONG_MIN;
  while (t--) {
    long long a, b, c;
    cin >> n >> a >> b >> c;
    if (a <= b - c)
      ans = (n / a);
    else if (n >= c)
      ans = (n - c) / (b - c) + (n - (n - c) / (b - c) * (b - c)) / a;
    else
      ans = n / a;
    ans = max(0ll, ans);
    cout << ans;
    cout << "\n";
  }
  return 0;
}
