# https://ja.wikipedia.org/wiki/%E3%83%95%E3%83%AD%E3%83%99%E3%83%8B%E3%82%A6%E3%82%B9%E3%81%AE%E7%A1%AC%E8%B2%A8%E4%BA%A4%E6%8F%9B%E5%95%8F%E9%A1%8C

import sys
input = sys.stdin.readline

from math import gcd,lcm

Q=int(input())

for tests in range(Q):
    X,N,d=map(int,input().split())

    if X==1:
        print(-1)
        continue
    if gcd(X,d)!=1:
        print("inf")
        continue

    ANS=((X-2)//N+1)*X+(d-1)*(X-1)-1
    print(ANS)