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

int main()
{
int i;
int j;
int N;
int M;
char A[ 100 ];
char C;
int iSum;

	ios::sync_with_stdio( false );
	cin.tie( 0 );

	cin >> N;
	cin >> M;

	iSum = 0;
	for( i = 0; i < N; i++ )
	{
		cin >> A;

		for( j = 0; j < M; j++ )
		{
			if( A[ j ] == 'W' ) iSum++;
		}
	}

	cout << iSum << endl;

	return 0;
}