func main()
	var n: int :: cui@inputInt()
	var m: int :: cui@inputInt()
	
	var num: []int :: lib@range(0, n, 1)
	
	for i(0, m - 1)
		var a: int :: cui@inputInt()
		var tmp: int :: num[a]
		for j(a - 1, 1, -1)
			do num[j + 1] :: num[j]
		end for
		do num[1] :: tmp
	end for
	var ans: int :: num[1]
	do cui@print("\{ans}\n")
end func