#include <bits/stdc++.h>
const int maxn = 1000000 + 50;
const int maxm = 4e5 + 10;
const int inf_max = 0x3f3f3f;
using namespace std;
long long n, k;
const long long MAX = 2000000000;
long long check(long long cur) {
  long long group = cur / n;
  cur -= group;
  return cur;
}
int main() {
  int t;
  cin >> t;
  while (t--) {
    cin >> n >> k;
    long long l = 1, r = 3000000000;
    while (l <= r) {
      long long mid = (l + r) >> 1;
      if (mid % n == 0) {
        long long tt = mid / n, tmp = mid;
        tmp -= tt;
        if (tmp == k) {
          printf("%lld\n", mid - 1);
          break;
        } else if (tmp > k)
          r = mid - 1;
        else
          l = mid + 1;
      } else {
        long long cur = check(mid);
        if (cur == k) {
          printf("%lld\n", mid);
          break;
        } else if (cur > k)
          r = mid - 1;
        else
          l = mid + 1;
      }
    }
  }
  return 0;
}
