#include <bits/stdc++.h>
//#include <atcoder/all>
using namespace std;
//using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
//using mint = modint998244353;
//const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
//const bool debug = false;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
long long dp[61][61][4000];
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	string s; cin >> s;
	int fdcount = 0, zero = 0;
	rep(i, s.size())rep2(j, i + 1, s.size()) if (('1' == s[i]) && ('0' == s[j]))fdcount++;
	rep(i, s.size())if ('0' == s[i])zero++;
	dp[0][0][0] = 1;
	rep(i, s.size()) rep(j, zero + 1)rep(k, fdcount + 1) {
		if (0 == dp[i][j][k])continue;
		dp[i + 1][j + 1][k + i - j] += dp[i][j][k];
		dp[i + 1][j][k] += dp[i][j][k];
	}
	cout << dp[s.size()][zero][fdcount] << endl;
	return 0;
}