Problem: A Darie is a special circle. Numbers 1, 2, ..., n are written clockwise around this circle in order. You can stand on a number! Initially Rasta is on number 1. In each step, he jumps exactly p numbers clockwise. For example if n = 3 and he is standing on number 1:

If p = 1 then he jumps to number 2.

Or if p = 2 he jumps to number 3.

He does this until he reaches a number he's been on before (for example, if n = 3, p = 1 he stops after three jumps).

Then he writes down the numbers he had been on, as a sequence s in increasing order.

He's not a Mr.Memmory, so he can't remember this sequence. He asks you to help him by telling him the k-th number in this sequence (or -1 if size of s is less than k).

Input format
The first line of input contains an integer t, the number of testcases (1 ≤ t ≤ 10^5).

Each testcase is given in one line, which contains three integers n, p, k (2 ≤ n ≤ 10^6, 1 ≤ p ≤ n - 1, 1 ≤ k ≤ 10^6).

Output format
Print the answer of each testcase in one line.

SAMPLE INPUT
3
12 5 3
12 3 2
3 2 2

SAMPLE OUTPUT
3
4
2

Solution (in PYTHON):

Solution:
t = int(raw_input())
def gcd(a, b):
	while a and b:
		if a > b:
			a = a%b 
		else:
			b = b%a
	return a + b

for _ in range(t):
	n, p, k = map(int, raw_input().split())
	g = gcd(n, p)
	if (k - 1) * g < n:
		print (k - 1) * g + 1
	else:
		print -1