#include <stdio.h>

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

   char arr[tate][yoko];

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