A0024

gistfile1.java

import java.util.*;

public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		while (scn.hasNext()) {
			double v = scn.nextDouble();
			System.out.println((int)(v * v / 98 + 1) + 1);
		}
	}
}