# coding=UTf-8:
def road(r):
    r_num = [0 for i in range(len(r)+1)]
    r_num[0] = 1
    if len(r) == 0:
        return r_num[0]
    else:
        n = 0
        for i in range(len(r)):
            if r[i] == "R":
                n += 1
                r_num[n] = (r_num[n-1] * 2) + 1
            elif r[i] == "L":
                n += 1
                r_num[n] = (r_num[n-1] * 2)
        return r_num[len(r)]


s = str(input())
print(road(s))