using System;
using System.IO;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Numerics;
using System.Diagnostics;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using static System.Math;
using static System.Console;


namespace yukicoder
{
    class Program
    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            int m = int.Parse(Console.ReadLine());
            int ans = 0;

            for (int i = 0; i < m; i++)
            {
                var s = Console.ReadLine().Split().Select(int.Parse).ToArray();
                var s1 = s[0];
                var s2 = s[1];

                if (n == s1)
                {
                    n = s2;
                }
                else if (n == s2)
                {
                    n = s1;
                }
            }

            Console.WriteLine(n);

        }
    }
}