def mainProc(lst):

    total = 0
    for l in lst:
        total += len(list(filter( lambda x: x == 'W', l)))
    print(total)
    
if __name__ == '__main__':

    n, m = map(int,input().split())
    lst = []
    for i in range(n):
        lst.append(input())
    mainProc(lst)