// Problem: D2. Removal of a Sequence (Hard Version)
// Contest: Codeforces - Educational Codeforces Round 184 (Rated for Div. 2)
// URL: https://codeforces.com/contest/2169/problem/D2
// Memory Limit: 512 MB
// Time Limit: 2000 ms
//
// Powered by CP Editor (https://cpeditor.org)

#include <assert.h>
#include <bits/stdc++.h>
using namespace std;
#ifndef __DEBUG__
#define dbg(...) 42
#endif
template <class T> using mpq = priority_queue<T, vector<T>, greater<T>>;

namespace rngs = std::ranges;
using ll = long long;
using a2l = array<ll, 2>;
using vl = vector<ll>;

void solve()
{
    ll x, y, k, n = 1e12;
    cin >> x >> y >> k;
    if (y == 1) {
        assert(x != 0);
        cout << -1 << '\n';
        return;
    }

    ll t = y - 1;
    while (x > 0) {
        ll d = k / t;
        if (d) {
            ll a = (t - k % t) / d + 1;
            // a = min(a, (n - k) / d);
            a = min(a, x);
            dbg(a, x, d, k);

            k += a * d;
            x -= a;
        } else {
            break;
        }
    }

    if (k <= n) {
        cout << k << '\n';
    } else {
        cout << -1 << '\n';
    }
}

int main(int argc, char **argv)
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    ll t = 1;
    cin >> t;
    while (t--)
        solve();

    return 0;
};