func main()
	var n: int :: cui@inputInt()
	var dic: dict<int, int> :: #dict<int, int>
	for i(0, n - 1)
		var a: int :: cui@inputInt()
		var cnt: int :: 0
		if(dic.exist(a))
			do cnt :: dic.get(a, &)
		end if
		do dic.add(a, cnt + 1)
	end for
	var ans: lib@Int :: #lib@Int
	do dic.forEach(f, ans)
	do cui@print("\{ans.value}\n")
	
	func f(key: int, value: int, data: kuin@Class): bool
		if(value = 1)
			do(data $ lib@Int).value :+ 1
		end if
		ret true
	end func
end func