# -*- coding: utf-8 -*-

n,m = map(int,input().split())
a = [0] * n
for i in range(n):
    a[i] = list(input())

ans = 0

for i in range(n):
    for j in range(len(a[0])):
        if a[i][j] == "W":
            ans += 1

print(ans)