using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var s = "S3;S4;S3;S4;S5;S5;S4;S4;S4";

        string[] words = s.Split(';');

        int x=0;

        foreach (string word in words)

        {

             x= s.Count(x => x == '&');

            Console.WriteLine(x);

        }

    }

}