import java.util.*;
public class Tinh_tien_gui_ngan_hang {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc=new Scanner(System.in);
		float lai=0;
		float tien=sc.nextFloat();
		do {
		lai=(float)(tien*0.5)/100;
		tien=tien+lai;
		}while (tien<1000000000);
	System.out.println("Ban se tro thanh ti phu sau "+" thang");
	}

}
