Main.java

import java.io.*;
import java.util.*;

class Main {
 public static void main(String[] args) throws IOException {
 // 입력:
 Scanner scan = new Scanner(System.in);
 int a = scan.nextInt();
 int b = scan.nextInt();
 int c = scan.nextInt();

 int sum = 0;
 for(int i = a; i <= b; i++){
 int count = 0;
 for(int j = 1; j <= c; j++){
 if(i % j == 0) {
 count++;
 }
 }
 if (count == 2){
 sum += i;
 }
 }
 System.out.println(sum);
 }
}