#!python
# -*- coding: utf-8 -*-


def main():
    N, M = map(int, input().split())
    A = []
    for i in range(N):
        A.append(input())

    ANS = 0
    for i in range(N):
        ANS += A[i].count('W')

    print(ANS)


if __name__ == '__main__':
    main()