import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        long time = System.nanoTime();

        int n = 100000;
        int[] x = new int[n];
        for(int i = 0; i < n; i++){
            x[i] = n-i;
        }
        int[] next = new int[n];
        for (int i = 0; i < n - 1; i++) next[i] = i + 1;
        next[n - 1] = -1;

        int count = 0;
        ArrayList<Integer> eat = new ArrayList<Integer>();
        for (int i = 0; i < n; i++) eat.add(i);
        while (true) {
            ArrayList<Integer> neweat = new ArrayList<Integer>();
            for (int start : eat) {
                boolean flag = false;
                int xx = start;
                while (true) {
                    int yy = next[xx];
                    if (yy == -1 || x[yy] > x[xx]) {
                        next[start] = yy;
                        break;
                    }
                    xx = yy;
                    flag = true;
                }
                if (flag) neweat.add(start);
            }
            if (neweat.size() != 0) count++;
            else break;
            eat = neweat;
//          System.out.println(eat.size());
        }

        out.println(count);

///     System.out.println((System.nanoTime() - time)* 1e-9);
        out.close();
    }
    static PrintWriter out = new PrintWriter(System.out);

    static BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer in = new StringTokenizer("");

    static String nextToken() throws Exception {
        if (!in.hasMoreTokens()) in = new StringTokenizer(bufferedreader.readLine());
        return in.nextToken();
    }

    static int next()  throws Exception {return Integer.parseInt(nextToken());};
    static int[] next(int n) throws Exception {
        int[] x = new int[n];
        for (int i = 0; i < n; i++) x[i] = next();
        return x;
    }
    static int[][] next(int n, int m) throws Exception {
        int[][] x = new int[n][];
        for (int i = 0; i < n; i++) x[i] = next(m);
        return x;
    }

    static long nextl() throws Exception {return Long.parseLong(nextToken());};
    static long[] nextl(int n) throws Exception {
        long[] x = new long[n];
        for (int i = 0; i < n; i++) x[i] = nextl();
        return x;
    }
    static long[][] nextl(int n, int m) throws Exception {
        long[][] x = new long[n][];
        for (int i = 0; i < n; i++) x[i] = nextl(m);
        return x;
    }

    static double nextd() throws Exception {return Double.parseDouble(nextToken());};
    static double[] nextd(int n) throws Exception {
        double[] x = new double[n];
        for (int i = 0; i < n; i++) x[i] = nextd();
        return x;
    }
    static double[][] nextd(int n, int m) throws Exception {
        double[][] x = new double[n][];
        for (int i = 0; i < n; i++) x[i] = nextd(m);
        return x;
    }

    static String nextline() throws Exception {
        in = new StringTokenizer("");
        return bufferedreader.readLine();
    }

}