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package com.javarush.task.pro.task04.task0412;
import java.util.Scanner;
/*
Сумма кратных чисел
*/
public class Solution {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int start = scanner.nextInt();
int end = scanner.nextInt();
int multiple = scanner.nextInt();
int sum = 0;
for (start = start; start <= end; start++)
{
if ( (start % multiple) == 0) sum = sum + start;
else
continue;
}
System.out.println(sum);
}
}