using System;

public class Program

{

    public static int Bornes(int a, int b)

    {

        int resultat=0;

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

        {

            resultat+=i;    

        }

        return 0;

    }

    public static void Main()

    {

        Console.WriteLine(Bornes(10,15));

    }

}