package main

import (
	"fmt"
)

func main() {
	var n, m, j int
	cards := make([]int, 0, 50)
	shuffle := make([]int, 0, 500)

	fmt.Scanln(&n, &m)

	for i := 1; i <= n; i++ {
		cards = append(cards, i)
	}

	for i := 0; i < m; i++ {
		fmt.Scanf("%d", &j)
		shuffle = append(shuffle, j-1)
	}

	fmt.Println(shuffle)
	for _, v := range shuffle {
		tmp := append([]int{cards[v]}, cards[:v]...)
		cards = append(tmp, cards[v+1:]...)
	}

	fmt.Println(cards[0])
}