#include <bits/stdc++.h>

using namespace std;
#define ll long long
#define ld long double

const ld PI = acos(-1);
const ll N = 1e6 + 5, MOD = 1e9 + 7, oo = 2e9, OO = 2e18;

#define nl '\n'
#define sp ' '
#define F first
#define S second
#define EPS 1e-4
#define pb push_back
#define mkp make_pair
#define rz return 0;
#define rv return void
#define em emplace_back
#define sz(s) (ll)(s.size())
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define Tests int test_cases; cin >> test_cases; for(int tc=1; tc<=test_cases; tc++)
#define WAAAAADY ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);

void y3ni_mht3dee4() {
    ll p, q, n, sum = 0;
    cin >> p >> q >> n;
    ll tmp_p = p;
    for (int i = 1; i <= n; i++) {
        // cout << p << sp;
        sum += (p % q);
        p += tmp_p;
    }
    cout << sum << nl;
}

signed main() {
    WAAAAADY
    Tests y3ni_mht3dee4();
}