01. Integer Operations

import java.util.Scanner;

public class Division_02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        //4 integers
        // ((n1 + n2) / n3) * n4

        int number1 = Integer.parseInt(scanner.nextLine());
        int number2 = Integer.parseInt(scanner.nextLine());
        int number3 = Integer.parseInt(scanner.nextLine());
        int number4 = Integer.parseInt(scanner.nextLine());

        System.out.println(((number1 + number2) / number3) * number4);


    }
}