#line 2 "/Users/noya2/Desktop/Noya2_library/template/template.hpp"
using namespace std;

#include<bits/stdc++.h>
#line 1 "/Users/noya2/Desktop/Noya2_library/template/inout_old.hpp"
namespace noya2 {

template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &p){
    os << p.first << " " << p.second;
    return os;
}
template <typename T, typename U>
istream &operator>>(istream &is, pair<T, U> &p){
    is >> p.first >> p.second;
    return is;
}

template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v){
    int s = (int)v.size();
    for (int i = 0; i < s; i++) os << (i ? " " : "") << v[i];
    return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &v){
    for (auto &x : v) is >> x;
    return is;
}

void in() {}
template <typename T, class... U>
void in(T &t, U &...u){
    cin >> t;
    in(u...);
}

void out() { cout << "\n"; }
template <typename T, class... U, char sep = ' '>
void out(const T &t, const U &...u){
    cout << t;
    if (sizeof...(u)) cout << sep;
    out(u...);
}

template<typename T>
void out(const vector<vector<T>> &vv){
    int s = (int)vv.size();
    for (int i = 0; i < s; i++) out(vv[i]);
}

struct IoSetup {
    IoSetup(){
        cin.tie(nullptr);
        ios::sync_with_stdio(false);
        cout << fixed << setprecision(15);
        cerr << fixed << setprecision(7);
    }
} iosetup_noya2;

} // namespace noya2
#line 1 "/Users/noya2/Desktop/Noya2_library/template/const.hpp"
namespace noya2{

const int iinf = 1'000'000'007;
const long long linf = 2'000'000'000'000'000'000LL;
const long long mod998 =  998244353;
const long long mod107 = 1000000007;
const long double pi = 3.14159265358979323;
const vector<int> dx = {0,1,0,-1,1,1,-1,-1};
const vector<int> dy = {1,0,-1,0,1,-1,-1,1};
const string ALP = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const string alp = "abcdefghijklmnopqrstuvwxyz";
const string NUM = "0123456789";

void yes(){ cout << "Yes\n"; }
void no(){ cout << "No\n"; }
void YES(){ cout << "YES\n"; }
void NO(){ cout << "NO\n"; }
void yn(bool t){ t ? yes() : no(); }
void YN(bool t){ t ? YES() : NO(); }

} // namespace noya2
#line 2 "/Users/noya2/Desktop/Noya2_library/template/utils.hpp"

#line 6 "/Users/noya2/Desktop/Noya2_library/template/utils.hpp"

namespace noya2{

unsigned long long inner_binary_gcd(unsigned long long a, unsigned long long b){
    if (a == 0 || b == 0) return a + b;
    int n = __builtin_ctzll(a); a >>= n;
    int m = __builtin_ctzll(b); b >>= m;
    while (a != b) {
        int mm = __builtin_ctzll(a - b);
        bool f = a > b;
        unsigned long long c = f ? a : b;
        b = f ? b : a;
        a = (c - b) >> mm;
    }
    return a << std::min(n, m);
}

template<typename T> T gcd_fast(T a, T b){ return static_cast<T>(inner_binary_gcd(std::abs(a),std::abs(b))); }

long long sqrt_fast(long long n) {
    if (n <= 0) return 0;
    long long x = sqrt(n);
    while ((x + 1) * (x + 1) <= n) x++;
    while (x * x > n) x--;
    return x;
}

template<typename T> T floor_div(const T n, const T d) {
    assert(d != 0);
    return n / d - static_cast<T>((n ^ d) < 0 && n % d != 0);
}

template<typename T> T ceil_div(const T n, const T d) {
    assert(d != 0);
    return n / d + static_cast<T>((n ^ d) >= 0 && n % d != 0);
}

template<typename T> void uniq(std::vector<T> &v){
    std::sort(v.begin(),v.end());
    v.erase(unique(v.begin(),v.end()),v.end());
}

template <typename T, typename U> inline bool chmin(T &x, U y) { return (y < x) ? (x = y, true) : false; }

template <typename T, typename U> inline bool chmax(T &x, U y) { return (x < y) ? (x = y, true) : false; }

template<typename T> inline bool range(T l, T x, T r){ return l <= x && x < r; }

} // namespace noya2
#line 8 "/Users/noya2/Desktop/Noya2_library/template/template.hpp"

#define rep(i,n) for (int i = 0; i < (int)(n); i++)
#define repp(i,m,n) for (int i = (m); i < (int)(n); i++)
#define reb(i,n) for (int i = (int)(n-1); i >= 0; i--)
#define all(v) (v).begin(),(v).end()

using ll = long long;
using ld = long double;
using uint = unsigned int;
using ull = unsigned long long;
using pii = pair<int,int>;
using pll = pair<ll,ll>;
using pil = pair<int,ll>;
using pli = pair<ll,int>;

namespace noya2{

/*　~ (. _________ . /)　*/

}

using namespace noya2;


#line 2 "c.cpp"

#line 2 "/Users/noya2/Desktop/Noya2_library/string/eertree.hpp"

#line 7 "/Users/noya2/Desktop/Noya2_library/string/eertree.hpp"

namespace noya2 {

template<int sigma = 26>
struct eertree {
    static_assert(sigma <= 256);
    using child = std::array<int,sigma>;
    static constexpr child makeleaf(){
        child ret = {};
        ret.fill(-1);
        return ret;
    }
    static constexpr child leaf = makeleaf();
    struct node {
        int suffix_link;
        int length;
        child ch;
        explicit node (int _suffix_link, int _length) : suffix_link(_suffix_link), length(_length), ch(leaf) {}
        friend ostream &operator<<(ostream &os, const node &p){
            return os << "suffix link : " << p.suffix_link << " length : " << p.length;
        }
    };
    int cursor = 1;
    std::vector<node> nodes;
    std::vector<uint8_t> str;
    int find_suffix(int pos, int cur){
        while (cur >= 0){
            int len = nodes[cur].length;
            int sop = pos - len - 1;
            if (sop >= 0 && str[sop] == str[pos]) return cur;
            cur = nodes[cur].suffix_link;
        }
        return 0;
    }
    eertree (){
        nodes = {node(-1,-1),node(0,0)};
    }
    // if 'a' is added, call add_char(0)
    // current cursor, parent of child_tree, parent of suffix_tree
    std::tuple<int,int,int> add_char(int c){
        int pos = str.size();
        str.emplace_back(c);
        cursor = find_suffix(pos, cursor);
        // add child to str(cursor)
        int ch = nodes[cursor].ch[c];
        // already exists
        if (ch != -1){
            auto ret = std::make_tuple(ch, cursor, nodes[ch].suffix_link);
            cursor = ch;
            return ret;
        }
        // new node
        const int ncursor = nodes.size();
        const int nlength = nodes[cursor].length + 2;
        const int npar = find_suffix(pos, nodes[cursor].suffix_link);
        int nsuffix_link = nodes[npar].ch[c];
        // c is new char
        if (nsuffix_link == -1){
            nsuffix_link = 1;
        }
        nodes[cursor].ch[c] = ncursor;
        nodes.emplace_back(nsuffix_link, nlength);
        auto ret = make_tuple(ncursor, cursor, nsuffix_link);
        cursor = ncursor;
        return ret;
    }
    node operator[](int idx) const {
        return nodes[idx];
    }
};


} // namespace noya2
#line 4 "c.cpp"

void solve(){
    string s; in(s);
    eertree et;
    int n = s.size();
    vector<int> spar(n+2);
    vector<ll> count(n+2,0);
    for (auto c : s){
        auto [v, cp, sp] = et.add_char(c - 'a');
        spar[v] = sp;
        count[v]++;
    }
    for (int i = n+1; i >= 1; i--){
        count[spar[i]] += count[i];
    }
    vector<ll> dp(n+2,0);
    for (int i = n+1; i >= 1; i--){
        dp[i] += count[i] * et[i].length;
        chmax(dp[spar[i]],dp[i]);
    }
    out(dp[0]);
}

int main(){
    int t = 1; //in(t);
    while (t--) { solve(); }
}