#include <bits/stdc++.h>

using namespace std;

// #define LOCK_GETCHAR
// #define USE_INT_128

#if __cplusplus < 201400
#warning "Please use c++14 or higher."
#define CONSTEXPR_FUNC
#define ENABLE_IF_INT
#else
#define CONSTEXPR_FUNC constexpr
#define ENABLE_IF_INT , enable_if_t<_is_integer<T>, int> = 0
template <class T> constexpr bool _is_integer = numeric_limits<T>::is_integer;
template <> constexpr bool _is_integer<bool> = false;
template <> constexpr bool _is_integer<char> = false;
#ifdef USE_INT_128
template <> constexpr bool _is_integer<__int128> = true;
template <> constexpr bool _is_integer<__uint128_t> = true;
#endif
#endif

#if !defined(_WIN32) && !defined(__CYGWIN__) && !defined(LOCK_GETCHAR)
#define getchar getchar_unlocked
#endif

#define il inline
#define mkp make_pair
#define fi first
#define se second
#define ssz(x) (signed((x).size()))
#define _loop_i_t(j, k) make_signed_t<decltype((j) - (k))>
#define For(i, j, k) for (_loop_i_t(j, k) i = (j); i <= (k); ++i) // NOLINT
#define ForDown(i, j, k)                                                       \
  for (_loop_i_t(j, k) i = (j); i >= decltype(i)(k); --i) // NOLINT
#define eb emplace_back
#ifndef ONLINE_JUDGE
#define FileIO(filename)                                                       \
  freopen(filename ".in", "r", stdin);                                         \
  freopen(filename ".out", "w", stdout)
#else
#define FileIO(filename) void(0)
#endif

using ll = long long;
using uint = unsigned int;
using ull = unsigned long long;
using db = double;
using ldb = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#ifdef USE_INT_128
using lll = __int128_t;
using ulll = __uint128_t;
#endif

// clang-format off
CONSTEXPR_FUNC il ll qpow(ll x, ull y, ll mod){ ll ans = 1; x %= mod; while (y) { if (y & 1) (ans *= x) %= mod; (x *= x) %= mod; y >>= 1; } return ans; }
template<typename T> CONSTEXPR_FUNC il void cmin(T & x, const T &y){ x = min(x, y); }
template<typename T> CONSTEXPR_FUNC il void cmax(T & x, const T &y){ x = max(x, y); }
template<typename T ENABLE_IF_INT> il void read(T &x){ x = 0; int f = 1; int c = getchar(); while (!isdigit(c)) { if (c == '-') f = -1; c = getchar(); } while (isdigit(c)) { x = x * 10 + (c - '0'); c = getchar(); } x *= f; }
template<typename T, typename ... Args> il void read(T &x, Args &... y){ read(x), read(y...); }
// clang-format on

// File head end

namespace {
constexpr ll MAXN = 4e5 + 5;
struct Node {
  int len, cnt, link;
  array<int, 26> nxt;
  Node() : len(0), cnt(0), link(-1) { memset(nxt.data(), -1, sizeof nxt); }
  Node(int _a, int _b, int _c) : len(_a), cnt(_b), link(_c) {
    memset(nxt.data(), -1, sizeof nxt);
  }
} sam[MAXN];
string str;
int lst = 0, cnt = 1;
vector<int> T[MAXN];
void ins(char ch) {
  int c = ch - 'a', p = lst;
  sam[lst = cnt++] = {sam[p].len + 1, 1, 0};
  while (~p && !~sam[p].nxt[c])
    sam[p].nxt[c] = lst, p = sam[p].link;
  if (!~p)
    return;
  int q = sam[p].nxt[c];
  if (sam[q].len == sam[p].len + 1) {
    sam[lst].link = q;
  } else {
    int clone = cnt++;
    sam[clone] = sam[q], sam[clone].len = sam[p].len + 1;
    sam[q].link = sam[lst].link = clone;
    sam[clone].cnt = 0;
    while (~p && sam[p].nxt[c] == q)
      sam[p].nxt[c] = clone, p = sam[p].link;
  }
}
int ans = 0;
void dfs(int x) {
  for (int v : T[x]) {
    dfs(v), sam[x].cnt += sam[v].cnt;
  }
  if (sam[x].cnt > 1)
    cmax(ans, sam[x].cnt * sam[x].len);
}
il void Main() {
  cin.tie(0)->sync_with_stdio(0);
  cin >> str;
  for (char c : str)
    ins(c);
  For(i, 1, cnt - 1) T[sam[i].link].eb(i);
  // cerr << cnt << '\n';
  dfs(0), cout << ans << '\n';
}
} // namespace

signed main() { return Main(), 0; }