// editor5
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        try {
            int income = sc.nextInt();
            int expense = sc.nextInt();
            if (income < 0 || expense < 0) {
                throw new Exception("Invalid input");
            }
            if (expense == 0) {
                throw new Exception("Cannot divide by zero");
            }
            double div = (double) income/expense;
            System.out.printf(div);

        } 
        catch (Exception e) {
            System.out.println("Invalid input");
        } 
    }
}