func main()
	var t: int :: cui@inputInt()
	var a: int :: cui@inputInt()
	var b: int :: cui@inputInt()
	var ans: int :: (t - 1) / a + (t - 1) / b - (t - 1) / a / (b / math@gcd(a, b)) + 1
	do cui@print("\{ans}\n")
end func