N = input().rstrip()

ans = 0
if len(N) <= 2:
    ans = int(N) // 3 - 3
else:
    a = [1]
    carry = False
    for v in N:
        if carry:
            for i in range(len(a)):
                a[i] *= 4
        else:
            for i in range(len(a) - 1):
                a[i] *= 4

            if int(v) % 3 == 0:
                a[-1] *= int(v) // 3
                a.append(1)
            else:
                a[-1] *= int(v) // 3 + 1
                carry = True
    ans = sum(a) + 14

print(ans)