def main():
    S=input()
    N=len(S)
    Zero=S.count('0')
    One=N-Zero
    cnt=[0]*4
    for i in range(N):
        if S[i]=='0':
            cnt[0]+=(i+1)
            cnt[1]+=N-i
        else:
            cnt[2]+=(i+1)
            cnt[3]+=N-i
    L=0
    Z=0
    if Zero<=One:
        Z=Zero
        L=min(cnt[0],cnt[1])
    else:
        Z=One
        L=min(cnt[2],cnt[3])
    dp=[[0 for i in range(L+1)] for j in range(Z+1)]
    dp[0][0]=1
    for i in range(1,N+1):
        ndp=[[0 for i in range(L+1)] for j in range(Z+1)]
        for j in range(Z+1):
            for k in range(L+1):
                ndp[j][k]+=dp[j][k]
                if j>0 and k-i>=0:
                    ndp[j][k]+=dp[j-1][k-i]
                ndp[j][k]
        dp=ndp
    print(dp[Z][L])
if __name__=='__main__':
    main()