using System;
using System.Collections;
using System.Collections.Generic;
class Example
{ public static void Main()
  { Random r = new Random();
    List<int> l = new List<int>(10);
    for (int j=0; j<10; j++)
    { l.Add(r.Next(31)-15);
      Console.Write("{0} ",l[j]);
    } 
    int k=0, s=0;
    while ((k<l.Count-1) && (0<l[k])) k++;
    k++;
    if (k<l.Count)
    for (int j=k; j<l.Count; j++) s+=l[j]; 
    Console.WriteLine("\nШукана сума: {0} ",s);
  }
}