using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var map = NArr(n);
        Array.Sort(map, (l, r) => l[0].CompareTo(r[0]));
        var max = 1;
        var eid = 0;
        while (eid < n && map[eid][0] <= max)
        {
            max = Math.Max(max, map[eid][1]);
            ++eid;
        }
        WriteLine(max);
    }
}