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

namespace yukicoderTest
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] input = Console.ReadLine().Split(' ');
            int n = int.Parse(input[0]);
            string str = "";
            int wcnt = 0;
            for (int i = 0; i < n; i++)
            {
                str = Console.ReadLine();
                for (int j = 0; j < str.Length; j++)
                {
                    string temp = str.Substring(j, 1);
                    if(temp=="W")
                    {
                        wcnt++;
                    }
                }
            }
            Console.WriteLine(wcnt);
        }
    }
}