#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> pii;
typedef long long ll;
const int N = 2000010, MOD = 998244353, INF = 0x3f3f3f3f;
int n, m, w[N];


int main() {
    scanf("%d", &m);
    while (m--) {
        int x, n, d;
        scanf("%d%d%d", &x, &n, &d);
        if (__gcd(x, d) > 1) puts("inf");
        else printf("%lld\n", (ll)x * d - x - d + (ll)(x - 2) / n * x + x ? (ll)x * d - x - d + (ll)(x - 2) / n * x + x : -1);
    }
    return 0;
}