java program to calculate average of n numbers

int a, b, c, d;
		a = 2;
		b = 3;
		c = 5;
		d = 10;
		System.out.println("Average of n nubers is: " + (a + b + c + d) / 4);
		// OR
		Scanner scanner = new Scanner(System.in);
		System.out.println("Enter 1st number: ");
		int firstNumber = scanner.nextInt();
		System.out.println("Enter 2nd number: ");
		int secondNumber = scanner.nextInt();
		System.out.println("Enter 3rd number: ");
		int thirdNumber = scanner.nextInt();
		System.out.println("Enter 4th number: ");
		int fourthNumber = scanner.nextInt();
		System.out.println("Enter 5th number: ");
		int fifthNumber = scanner.nextInt();
		System.out.println("Enter 6th number: ");
		int sixthNumber = scanner.nextInt();
		System.out.println("Enter Nth number: ");
		int nthNumber = scanner.nextInt();
		scanner.close();
		System.out.println("Average of abouve input numbers is: "
				+ (firstNumber + secondNumber + thirdNumber + fourthNumber + fifthNumber + sixthNumber + nthNumber)
						/ 7.0);