using System;
public class Program
{
public static void Main()
Console.WriteLine(sum());
}
static int sum()
int[] note = new int[4] {2, 3, 4, 5};
int suma = 0;
foreach (int element in note)
if (element <= 10 & element >= 0)
suma = suma + element;
/*else
return -1; */
return suma; // This was missing