vidrizki.java

import java.util.*;
import java.io.IOException;
public class vidrizki {
    public static void main (String[] args) throws IOException
    {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        HashSet<Long> array = new HashSet<Long>();
        for (int i = 0; i <a; i++) {
            long b = in.nextLong();
            long c = in.nextLong();
            for (long j = b,p=1; j <=c; j+=p) {
                if(j%5==0)
                {
                    System.out.println(j);
                    array.add(j);
                    p=5;
                }
            }
        }
        System.out.println(array.size());
    }
}