n,m = map(int, input().split())
list1 = []
anser = 0
for i in range(n):
    a = input()
    b = list(a)
    list1.append(b)
for i in range(n):
    for i in range(m):
        if list1[n][m] == 'W':
            anser += 1
        else:
            pass
print(anser)