codeforces - k-th not divisible by n

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


}