import java.util.*;
class Main{
    public static void main(String[] args){
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        int b=sc.nextInt();
        double res;
        
        if(a<=0)
        {
            System.out.print("Invalid input");
            return;
        }
        else if(a>0 && b>0)
        {
            res=a/b/ 10;
        }
        System.out.printf("%.1f",res);
    }
}