import sys
readline=sys.stdin.readline

S=readline().rstrip()
N=len(S)
cnt0=S.count("0")
cnt1=S.count("1")
inve=sum(1 for i in range(N) for j in range(i+1,N) if S[i]>S[j])
dp=[[[0]*(inve+1) for c1 in range(cnt1+1)] for c0 in range(cnt0+1)]
dp[0][0][0]=1
for c0 in range(cnt0+1):
    for c1 in range(cnt1+1):
        for i in range(inve+1):
            if c0 and 0<=i-c1:
                dp[c0][c1][i]+=dp[c0-1][c1][i-c1]
            if c1:
                dp[c0][c1][i]+=dp[c0][c1-1][i]
ans=dp[cnt0][cnt1][inve]
print(ans)