import java.util.Scanner;
import java.util.stream.*;
public class Main {
/**
* Calculates the sum of numbers in the range from a to b both inclusive
* that are only divisible by n or m.
*
* @param a > 0
* @param b > 0
* @param n > 0
* @param m > 0
*
* @return sum of numbers from the range that are only divisible by n or m
*/
public static int sum(int a, int b, int n, int m) {
// write your code here
}
// Don't change the code below
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
int b = scanner.nextInt();
int n = scanner.nextInt();
int m = scanner.nextInt();
System.out.println(sum(a, b, n, m));
}
}
