using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace template
{
    class Program
    {
        static void Main(string[] args)
        {
            int ret = int.Parse(Console.ReadLine());
            int n = int.Parse(Console.ReadLine());
            for (int i = 0; i < n; i++)
            {
                int[] x = Console.ReadLine().Split().Select(int.Parse).ToArray();
                if (x[0] == ret) ret = x[1];
                else if (x[1] == ret) ret = x[0];
            }
            Console.WriteLine(ret);
        }
    }
}