#include <stdio.h>

int main(void)
{
	int n, m;
	char s[50][51];
	int count = 0;
	int i, j;

	scanf("%d %d", &n, &m);

	for (i = 0; i < n; i++) {
		scanf("%s", &s[i]);
	}

	for (i = 0; i < n; i++) {
		for (j = 0; j < m; j++) {
			if (s[i][j] == 'W')
				count++;
		}
	}

	printf("%d\n", count);

	return 0;
}