#include <stdio.h>

int main(void) {
    int N, M,C=0;
    char s[51];
    
    scanf("%d%d", &N, &M);
    for (int i = 0; i < N; i++) {
    	scanf("%s", s);
    	for (int j = 0; j < M; j++) {
    		if (s[j] == 'W') {
    			C++;
    		}
    	}
    }
    printf("%d", C);
}