using System;

using System.Linq;                  

public class Program

{

    public static void Main()

    {

        int[] a= {1,2,3,4,55,6,77,7,8,9};

        int[] b= {1,2,3,4,34,5,79,7,8,9};

        Console.WriteLine(GetCoincidence(a,b));

    }

    static int GetCoincidence(int[] a, int[] b)

    {

        return a.Where((x,i)=>x==b[i]).Count();

    }

}