import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
    	int l = sc.nextInt();
    	int r = sc.nextInt();
    	int c = sc.nextInt();
    	if(l + 2001 < r) r = l + 1002;
    	long min = Long.MAX_VALUE;
    	for(long i = l; i <= r; i++){
    		long k = i * c % 1000;
    		min = Math.min(k,min);
    	}
    	System.out.println(min);
    }
}