S = input()
N = len(S)
S = [int(S[i]) for i in range(N)]

inv = 0
for i in range(N):
    for j in range(i):
        if S[i]==0 and S[j]==1:
            inv += 1

one = S.count(1)
zero = S.count(0)

dp = [[[0 for k in range(N*(N-1)//2+1)]for j in range(one+1)] for i in range(zero+1)]
for j in range(one+1):
    dp[0][j][0] = 1
for i in range(1,zero+1):
    dp[i][0][0] = 1
    for j in range(1,one+1):
        for k in range(j):
            dp[i][j][k] = dp[i][j-1][k]
        for k in range(j,N*(N-1)//2+1):
            dp[i][j][k] = dp[i-1][j][k-j] + dp[i][j-1][k]

print(dp[zero][one][inv])