def count(N,M):
    num=0
    for i in range(N):
        for j in range(M):
            if A[i][j] == 'W':
                num += 1
    return num

matrix = input().split()
A = []
row = int(matrix[0])
column = int(matrix[1])
for i in range(int(matrix[0])):
    A.append(input())

#出力ゾーン
print(count(row,column))