using System;
using System.Linq;

class Program
{
    static void Main()
    {
        var tmp = Console.ReadLine().Split();
        int n = int.Parse(tmp[0]);
        int m = int.Parse(tmp[1]);
        var a = Console.ReadLine().Split().Select(int.Parse).ToArray();

        var num = new int[n];
        for (int i = 0; i < n; i++) num[i] = i + 1; 

        for (int i = 0; i < m; i++)
        {
            int tm = num[a[i] - 1];
            for (int j = a[i] - 1; j > 0; j--)
            {
                num[j] = num[j - 1];
            }
            num[0] = tm;
        }

        Console.WriteLine(num[0]);
    }
}