#include <iostream>
using namespace std;
int main()
{
    int sum=0,counter=0,avg,x,y;
    cout << "Input numbers: "; cin >> x >> y;
    for (int i = 0; i <y ; i++)
    {
        if (i%3==0||i%5==0)
        {
            if (x<i && y>i) {
                sum += i;
                counter++;
            }
        }
    }
    avg = sum / counter;
    cout << "The average of multiples is: " << avg << endl;
}