/* package whatever; // don't place package name! */

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

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int kills = 1;
		int deaths = 2;
		
		double kdr = 0;

		if(kills > 0 && deaths == 0){
			kdr = kills;
		}else if(kills > 0 && deaths > 0){
			kdr = kills/deaths;
		}
		
		System.out.println(kdr);
	}
}