#include <cassert>
#include <cstdio>
#include <cmath>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <numeric>
#include <algorithm>

using namespace std;
using lint = long long;
constexpr int MOD = 1000000007, INF = 1010101010;
constexpr lint LINF = 1LL << 60;

template <class T>
ostream &operator<<(ostream &os, const vector<T> &vec) {
	for (const auto &e : vec) os << e << (&e == &vec.back() ? "" : " ");
	return os;
}

#ifdef _DEBUG
template <class T>
void dump(const char* str, T &&h) { cerr << str << " = " << h << "\n"; };
template <class Head, class... Tail>
void dump(const char* str, Head &&h, Tail &&... t) {
	while (*str != ',') cerr << *str++; cerr << " = " << h << "\n";
	dump(str + (*(str + 1) == ' ' ? 2 : 1), t...);
}
#define DMP(...) dump(#__VA_ARGS__, __VA_ARGS__)
#else 
#define DMP(...) ((void)0)
#endif

template<int Modulo = MOD> struct Mint {

	lint val;
	constexpr Mint(lint v = 0) noexcept : val(v % Modulo) { if (val < 0) v += Modulo; }

	constexpr Mint& operator += (const Mint &r) noexcept {
		val += r.val;
		if (val >= Modulo) val -= Modulo;
		return *this;
	}
	constexpr Mint& operator -= (const Mint &r) noexcept {
		val -= r.val;
		if (val < 0) val += Modulo;
		return *this;
	}
	constexpr Mint& operator *= (const Mint &r) noexcept {
		val = val * r.val % Modulo;
		return *this;
	}
	constexpr Mint& operator /= (const Mint &r) noexcept {
		lint a = r.val, b = Modulo, u = 1, v = 0;
		while (b) {
			lint t = a / b;
			a -= t * b; swap(a, b);
			u -= t * v; swap(u, v);
		}
		val = val * u % Modulo;
		if (val < 0) val += Modulo;
		return *this;
	}

	constexpr Mint operator + (const Mint &r) const noexcept { return Mint(*this) += r; }
	constexpr Mint operator - (const Mint &r) const noexcept { return Mint(*this) -= r; }
	constexpr Mint operator * (const Mint &r) const noexcept { return Mint(*this) *= r; }
	constexpr Mint operator / (const Mint &r) const noexcept { return Mint(*this) /= r; }

	constexpr int getmod() { return Modulo; }
	constexpr Mint operator - () const noexcept { return val ? Modulo - val : 0; }

	constexpr bool operator == (const Mint &r) const noexcept { return val == r.val; }
	constexpr bool operator != (const Mint &r) const noexcept { return val != r.val; }

	friend ostream &operator << (ostream &os, const Mint<Modulo> &x) noexcept { return os << x.val; }
	friend istream &operator >> (istream &is, Mint<Modulo> &x) noexcept {
		lint tmp; is >> tmp;
		x = Mint<Modulo>(tmp);
		return is;
	}
	friend constexpr Mint<Modulo> modpow(const Mint<Modulo> &a, lint n) noexcept {
		Mint res(1), tmp = a;
		while (n > 0) {
			if (n & 1) res *= tmp;
			tmp *= tmp;
			n >>= 1;
		}
		return res;
	}
};

//// mod, base from https://gist.github.com/privet-kitty/295ac9202b7abb3039b493f8238bf40f
template< class Mint1 = Mint<2147483647>, class Mint2 = Mint<2147483629> >
class RollingHash {

private:
	vector<Mint1> hash1, pow1;
	vector<Mint2> hash2, pow2;
	const int base1 = 2147483634;
	const int base2 = 2147483627;
	int sz;
	
public:
	RollingHash() {}
	RollingHash(const string &s) :sz(s.size()) {

		hash1.assign(sz + 1, 0); pow1.assign(sz + 1, 1);
		hash2.assign(sz + 1, 0); pow2.assign(sz + 1, 1);

		for (int i = 0; i < sz; i++) {
			hash1[i + 1] = hash1[i] * base1 + s[i];
			pow1[i + 1] = pow1[i] * base1;	
			hash2[i + 1] = hash2[i] * base2 + s[i];
			pow2[i + 1] = pow2[i] * base2;
		}
	}

	pair<int, int> get(int l, int r) {
		int res1 = (hash1[r] - hash1[l] * pow1[r - l]).val;
		int res2 = (hash2[r] - hash2[l] * pow2[r - l]).val;
		return {res1, res2};
	}

};

int main() {

	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	int N;
	string S;
	cin >> N >> S;

	RollingHash<> rh(S);

	auto check = [&](int d) {
		map<pair<int, int>, int> mp;
		for (int i = 0; i + d <= N; i++) {
			auto hp = rh.get(i, i + d);
			if (mp.find(hp) == mp.end()) mp[hp] = i;
			else if (i - mp[hp] >= d) return true;
		}
		return false;
	};

	auto biSearch = [&](auto f) {
		int ok = -1;
		int ng = N;

		while (abs(ok - ng) > 1) {
			int mid = (ok + ng) / 2;

			if (f(mid)) ok = mid;
			else ng = mid;
		}

		return ok;
	};

	cout << biSearch(check) << "\n";

	return 0;
}

Measured memory_bytes: 768