#!/usr/bin/java --source 11

import java.util.ArrayList;
import java.util.Arrays;

public final class primes
{
  private static ArrayList<Integer> GetPrimes(int n)
  {
    ArrayList<Integer> aRes = new ArrayList<Integer>();
    int[] s;
    int i, j, m;
    int mroot, half;

    if (n < 2) return aRes;

    if (n == 2)
    {
      aRes.add(2);
      return aRes;
    }

    i = 0;
    s = new int[(n - 3 + 1) / 2];
    for (j = 3; j <= n; j += 2)
    {
      s[i] = j;
      i++;
    }

    mroot = (int)Math.sqrt(n);
    half = s.length - 1;
    i = 0;
    m = 3;

    while (m <= mroot)
    {
      if (s[i] != 0)
      {
        for (j = (m * m - 3) / 2; j <= half; j += m)
          s[j] = 0;
      }

      i++;
      m = 2 * i + 3;
    }

    aRes.add(2);
    for(i = 0; i < s.length; i++)
    {
      j = s[i];
      if (j != 0) aRes.add(j);
    }

    return aRes;
  }

  public static void main(String[] args)
  {
    ArrayList<Integer> aRes;
    int i;

    for (i = 1; i <= 5; i++)
    {
      aRes = GetPrimes(10000000);
      System.out.println(aRes.size());
    }
  }
}