#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

var n = I<int>();
var ez = Enumerable.Range(0, n).Select(_ => (I<int>(), I<int>())).Order();
var ans = 1;
foreach (var (a, b) in ez)
{
    if (a > ans) break;
    ans = Math.Max(ans, b);
}
Console.WriteLine(ans);