JS function to realize simple calculator

        var n = prompt(' Welcome to the easy calculator :\n1. Addition calculator :\n2. Subtraction calculator :\n3. Multiplication calculator :\n4 Division calculator :\n5. sign out :\n Please enter your choice :');

        function Calculate(n) {
    
            n = parseInt(n);
            while (n != 5) {
    

                switch (n) {
    
                    case 1:
                        n1 = parseInt(prompt(' Please enter the first number '));
                        n2 = parseInt(prompt(' Please enter the second number '));
                        alert(n1 + n2);

                        break;
                    case 2:
                        n1 = parseInt(prompt(' Please enter the first number '));
                        n2 = parseInt(prompt(' Please enter the second number '));

                        alert(n1 - n2);

                        break;
                    case 3:
                        n1 = parseInt(prompt(' Please enter the first number '));
                        n2 = parseInt(prompt(' Please enter the second number '));
                        alert(n1 * n2);

                        break;
                    case 4:
                        n1 = parseInt(prompt(' Please enter the first number '));
                        n2 = parseInt(prompt(' Please enter the second number '));
                        alert(n1 / n2);

                        break;
                    case 5:
                        n = 5;
                        break;
                }
                n = prompt(' Welcome to the easy calculator :\n1. Addition calculator :\n2. Subtraction calculator :\n3. Multiplication calculator :\n4 Division calculator :\n5. sign out :\n Please enter your choice :');
                n = parseInt(n);
            }
        }
        Calculate(n);