arrays 13/1

//#1
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Kelet(int[] a)
        {
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
        }
        static bool T37(int[] a)
        {
            int counter7 = 0, counter3 = 0;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] % 7 == 0)
                    counter7++;
                if (a[i] % 3 == 0)
                    counter3++;
            }
            return counter3 > counter7;
        }
        static void Main(string[] args)
        {
            int[] a = new int[10];
            Kelet(a);
            Console.WriteLine(T37(a));
        }
    }
}

//#2
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Kelet(int[] a)
        {
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
        }
        static int Smallest(int num)
        {
            int min = 0;
            while (num != 0)
            {
                if (num % 10 > min)
                    min = num;
                num /= 10;
            }
            return min;
        }
        static int Biggest(int num)
        {
            int max = 10;
            while (num != 0)
            {
                if (num % 10 < max)
                    max = num;
                num /= 10;
            }
            return max;
        }
        static void Main(string[] args)
        {
            int[] a = new int[10];
            Kelet(a);
            for (int i = 0; i < a.Length - 1; i++)
            {
                Console.WriteLine(Biggest(a[i]) + Smallest(a[i+1]));
            }
        }
    }
}

//#3
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Kelet(int[] a)
        {
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
        }
        static bool Middle(int a, int b, int c)
        {
            return (b > a && b > c);
        }
        static void Main(string[] args)
        {
            int[] a = new int[10];
            Kelet(a);
            int counter = 0;
            for (int i = 2; i < a.Length; i++)
                if (Middle(a[i - 2], a[i - 1], a[i]))
                    counter++;
            Console.WriteLine(counter);
        }
    }
}

//#4
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Kelet(int[] a)
        {
            for (int i = 0; i < a.Length; i++)
                a[i] = int.Parse(Console.ReadLine());
        }
        static double Do(int[] a)
        {
            int n = a.Length;
            if (n % 2 == 0)
            {
                return (a[n / 2 - 1] + a[n / 2]) / 2;
            }
            else
            {
                return a[n / 2];
            }
        }
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            int[] a = new int[n];
            Kelet(a);
            a[0] = (int)Do(a);
        }
    }
}

//#5