S = input()
n = len(S)
dp = [[0] * (n * n) for _ in range(1)]
dp[0][0] = 1
for t in range(1, n + 1):
    ndp = [[0] * (n * n) for _ in range(t + 1)]
    for i in range(t):
        for j in range(n * n):
            if dp[i][j] == 0:
                continue
            ndp[i + 1][j] += dp[i][j]
            ndp[i][j + i] += dp[i][j]
    dp = ndp
o = 0
inv = 0
for s in S:
    if s == '1':
        o += 1
    else:
        inv += o
print(dp[o][inv])