#include <stdio.h>

int main (void) {
    int N, M;
    int counter = 0;
    scanf("%d", &N);  scanf("%d", &M);
    char s[N][M];
    
    for (int i = 0; i < N; i++) {
        scanf("%s", s[i]);
        for (int j = 0; j < M; j++) {
            if (s[i][j] == 'W')  counter++;
        }
    }
    
    printf("%d\n", counter);
    
    return 0;
}