#include <bits/stdc++.h>   using namespace std;   const long long INF = 0x3ffffffffffff;   int main() {     long long T;     scanf( %lld , &T);     while (T--) {       long long k, n, a, b;       scanf( %lld%lld%lld%lld , &k, &n, &a, &b);       k -= b * n;       if (k <= 0)         printf( -1 n );       else         printf( %lld n , min(n, (k - 1) / (a - b)));     }   }   