3.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication4
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] A = { 3, 6, 7, 5, 3, 1, 7, 8, 9, 1, 4,6,2,7,9,2,7,3,2,2,6,4,2,7,3,5,3,7,8,2 };
            int indexMax = 0;

            for (int i = 0; i < A.Length; i++)
            {
                if (i==0 && i != A.Length)
                {
                    if(A[i + 1] < A[i])
                    {
                        indexMax = indexMax + 1;
                    }
                }
                else if (i != 0 && i == A.Length)
                {
                    if (A[i - 1] < A[i])
                    {
                        indexMax = indexMax + 1;
                    }
                }
                else if (i != 0 && i != A.Length)
                {
                    if (A[i] > A[i - 1] && A[i] > A[i + 1])
                    {
                        indexMax = indexMax + 1;
                    }
                }
            }
            Console.WriteLine("Количество локальных максимумов = " + indexMax);


        }

    }
}