using System;

using System.Collections.Generic

public class Program

{

    public static void Main()

    {

        var numbers2 = new List<int>() { 2, 3, 5, 7 };

int sum = 0;

for (int i = 0; i < numbers2.Length; i++)

{

    sum += numbers2[i];

}

​

        Console.WriteLine(sum);

    }

}