static void Main(string[] args)
         {
             int n, i, k, l, s = 0, f = 0;
             Console.WriteLine("Введите число элементов массива:");
             n=Convert.ToInt32(Console.ReadLine());
             int[] a=new int [n];
             Console.WriteLine("Введите элементы массива:");
             for (i = 0; i < n; ++i)
                 a[i] = Convert.ToInt32(Console.ReadLine());
             for(i=0;i<n;++i)
             {
                 if(a[i]%2!=0)
                 {
                     k = i;
                     break;
                 }
             }
             for(i=n-1;i>=0;--i)
             {
                 if(a[i]%2!=0)
                 {
                     l = i;
                     f = 1;
                     break;
                 }
             }
             if(f==0)
             {
                 Console.WriteLine("No");
                 Console.ReadKey();
                 System.Environment.Exit(0);
             }
             if(l-k>1)
             {
                 for (i = k + 1; i <= l - 1; ++i)
                     s += a[i];
             }
             Console.WriteLine("Sum=" + s);
             Console.ReadKey();
         }