#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int Q; cin >> Q;
    while(Q--){
        long long X,N,D; cin >> X >> N >> D;
        if(gcd(X,D) > 1){cout << "inf\n"; continue;}
        if(X == 1){cout << "-1\n"; continue;}
        if(D == 1){
            long long need = (X+N-1)/N;
            cout << X*need-1 << "\n";
            continue;
        }
        long long low = 0,high = 2e9;
        while(high-low > 1){
            long long mid = (high+low)/2;
            __int128_t x = X*mid+(__int128_t)D*N*mid;
            __int128_t y = X*(mid+D-1);
            if(x > y) high = mid;
            else low = mid;
        }
        {
            long long y = X*(high+D-1);
            cout << y-D << "\n";
        }
    }   
}