计算

#include <bits/stdc++.h>
using namespace std;
long long t,n,k;
int main(){
    cin >> t;
    while(t--){
        cin >> n >> k;
        if(k%(n-1)==0) cout << k/(n-1)*n-1<<endl;
        else cout << k/(n-1)*n+k%(n-1)<<endl;
    }
}