def main():
	a,b,c=map(int,input().split())
	ans1 = (c+b)//a
	ans2 = c // a
	ans = []
	if ans1*a-b == c:
		ans.append(ans1)
	if ans2*a == c:
		ans.append(ans2)
	ans.sort()
	if len(ans) > 0:
		for x in ans:
			print(x)
	else:
		print(-1)
	
if __name__ == "__main__":
	main()