#include <stdio.h>

int main(){
    int tate, yoko;
    scanf("%d%d",&tate,&yoko);

    int arr[tate][yoko];

    int count = 0;
    for(int i = 0;i < tate;i ++){
        for(int j = 0;j < yoko;j ++){
            scanf("%c",&arr[i][j]);
            if(arr[i][j] == 'W'){
                count++;
            }
        }
    }
    printf("%d",count);
}