func main()
	var n: int :: cui@inputInt()
	var sum: int :: 0
	for(1, n - 1)
		do sum :+ cui@inputInt()
	end for
	
	var ans: int :: 0
	for i(0, 100)
		if((sum + i) % n = 0)
			do ans :+ 1
		end if
	end for
	do cui@print("\{ans}\n")
end func