#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>
#include <cassert>

using namespace std;
using ll = unsigned long long;

ll A, B, K;

bool judge(ll X){
    return X-(X/A+X/B-X/lcm(A, B)) >= K;
}

void solve(){

    cin >> A >> B >> K;

    ll l=0, r=9e18, c;
    while(r-l>1){
        c = (l+r)/2;
        if (judge(c)) r=c;
        else l=c;
    }
  
    cout << r << endl;
    assert(r % A != 0 && r % B != 0);
    return;
}

int main(){

    ll T;
    cin >> T;

    while(T){
        T--;
        solve();
    }

    return 0;
}