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

public class NewMain {

    public static void main(String[] args) throws IOException{
        Scanner in = new Scanner (new FileReader ("DATA2.txt"));
        PrintWriter out = new PrintWriter (new FileWriter ("OUT2.txt"));

        for (int c = 0; c < 5; c++) {

            int x = in.nextInt();
            double y = 0;
            double z = 0;

            for (double i = 1; i <= x; i++) {
                for (double j = 1; j <= i; j++) {
                    if (i / j % 1 == 0) y++;
                }

                z = z + Math.ceil(y / 2);
                y = 0;
            }
            
            out.println((int)z);
        }

        out.close();
    }
}