def skew(n):
    s = 0
    i=0
    while n:
        i += 1
        t = n % 10
        n = n // 10
        s += t * (2**i-1)
    return s

while True:
    try:
        n = int(input())
        if n == 0:
            break
        print(skew(n))
    except:
        break