#include <stdio.h>

int main(void){
	int n,m;
	scanf("%d %d",&n,&m);
	char colorList[100] = "a";
	int whiteCount = 0;
	for(int i = 0 ; i < n;i++){
		scanf("%s",colorList);
		int j = 0;
		while(colorList[j] != '\0'){
			if(colorList[j] == 'W'){
				whiteCount++;
			}
			j++;
		}
	}
	printf("%d",whiteCount);
}