import java.util.*;

// yukicoder No.712 赤旗
public class Main {
    public static void main(String[] args) throws Exception {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        int M = in.nextInt();
        final int total = N * M;
        int count = 0;

        for(int i=0; i<N; i++){
            String L = in.next();
            char[] arr = L.toCharArray();
            
            for(char c : arr){
                if(c == 'W') {
                    count++;
                }
            }

        }
        System.out.println(count);

    }
}