#include <bits/stdc++.h>
using namespace std;
                                                                                   


int main(){
                                                                     

    int n, m, i, j;

    char a[51][51];

    int k = 0;


    cin >> n >> m;


    for( i = 0 ; i < n ; i = i + 1 ){

         for( j = 0 ; j < m ; j = j + 1 ){

              cin >> a[j][i];

              if( a[j][i] == 'W' ) k += 1;

              }

         }


    cout << k << endl;
    

    return 0;

    }