import java.util.*;
import java.io.*;
public class q2 {

	public static void main(String[] args) throws Exception {
		Scanner in = new Scanner(new FileReader("DATA2.txt"));
		BufferedWriter bw = new BufferedWriter (new FileWriter("OUT2.txt"));
		
		int num = 0, prev = 6, cnt = 0;
		int[] k = new int[1100];
		k[0] = 0;
		k[1] = 1;
		k[2] = 2;
		k[3] = 3;
		k[4] = 5;
		k[5] = 6;
		for(int x = 6; x < k.length; x++) {
			prev += (x%2 == 0) ? 2 : 1;
			k[x] = prev;
		}
		
		while (in.hasNext()){
			num  = in.nextInt();
			String fuckman = Integer.toString(k[num]);
			bw.write(fuckman);
			if(cnt < 4) {
				bw.newLine();
			}
			cnt++;
		}
		bw.close();
	}
}