4/1

#include<iostream>
#include<cmath>

using namespace std;

int main()
{


    int a , b , sum=0;


    cout << "a:" ;
    cin >> a;
    cout << "b:";
    cin >> b;

    for(int i=a ; i < b ; i++){

    for(int j=1; j <= i ; j++){

        if(i%j == 0)
        sum+=j;
    }
    }


    cout << sum;

    return 0;







}