func main()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var k: int :: cui@inputInt()
	
	var ok: int :: a * k
	var ng: int :: 0
	while((ok - ng).abs() > 1)
		var mid: int :: (ok + ng) / 2
		if(mid / a + mid / b - mid / (math@lcm(a, b)) >= k)
			do ok :: mid
		else
			do ng :: mid
		end if
	end while
	var ans: int :: ok
	do cui@print("\{ans}\n")
end func