#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const ll MOD = 1000000007;
using P = pair<int,int>;
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()

int main(){
    string s;
    cin >> s;
    int n = s.size();
    vector<vector<vector<int>>> ppct(n/2+1,vector<vector<int>>(n/2+1));
    for(int i=2;i<=n/2;i++){
        int onecnt = 0;
        rep(j,i) onecnt += (s[j] == '1');
        ppct[i][onecnt].push_back(0);
        for(int j=i;j<n;j++){
            onecnt -= (s[j-i] == '1');
            onecnt += (s[j] == '1');
            ppct[i][onecnt].push_back(j-i+1);
        }
    }
    int ans = 1;
    set<P> seen;
    for(int i=2;i<=n/2;i++){
        for(auto vec:ppct[i]){
            int siz = vec.size();
            rep(j,siz-1){
                for(int k=j+1;k<siz;k++){
                    if(vec[k]-vec[j]<i) continue;
                    if(seen.count(make_pair(vec[j]+i-2,vec[k]+i-2))) continue;
                    if(s.substr(vec[j],i)==s.substr(vec[k],i)) continue;
                    ans++;
                    //cout << i << " " << vec[j] << " " << vec[k] << endl;
                    seen.insert(make_pair(vec[j],vec[k]));
                }
            }
        }
    }
    cout << ans << endl;
    return 0;
}