#include <bits/stdc++.h>
using std::cin;
using std::cout;

void work() {
	int n, V, L, R, t, ans, fl, cost;
	cin >> V >> L >> R >> t >> n, V /= n;
	for (n = ans = 1; n > 0; ++ans, n *= 2) {
		if (R - L <= (long long)n * t) {cout << ans - 1 << '\n'; return;}
		if ((fl = R - t - V / ans) > 0) cost = (fl + t - 1) / t, n -= cost, R -= cost * t;
	}
	cout << "impossible\n";
}

int main() {
	int T;
	std::ios::sync_with_stdio(false), cin.tie(NULL);
	for (cin >> T; T; --T) work();
	return 0;
}