def main():
    n, m = map(int, input().split())
    grid = []
    for i in range(n):
        grid.append([i for i in input()])

    num = 0
    for i in range(n):
        for j in range(m):
            if grid[i][j] == "W":
                num += 1

    print(num)


if __name__ == '__main__':
    main()