using System;

public class Hello
{
    static void Main()
    {
        var n = int.Parse(Console.ReadLine().Trim());
        string[] line = ("0 " + Console.ReadLine().Trim()).Split(' ');
        var r = Array.ConvertAll(line, int.Parse);
        getAns(n, r);
    }
    static void getAns(int n, int[] r)
    {
        var step = 0;
        var p = 1;
        while (p < n)
        {
            var nextmax = 0;
            var nextp = 0;
            var imax = r[p];
            if (imax == n) { Console.WriteLine(step + 1); return; }
            for (int i = p + 1; i <= imax; i++)
            {
                if (r[i] > nextmax)
                {
                    nextmax = r[i];
                    nextp = i;
                }
            }
            p = nextp;
            step++;
            if (r[p] == n) break;
        }
        Console.WriteLine(step + 1);
    }
}