//header{{{
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>

#include <boost/sort/spreadsort/spreadsort.hpp>
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/dijkstra_shortest_paths.hpp>
//#include <boost/graph/graph_utility.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/tag_and_trait.hpp>
#include <ext/pb_ds/trie_policy.hpp>

using namespace __gnu_pbds;
using namespace std;
//using namespace boost::multiprecision;
//using namespace boost::math;

typedef boost::adjacency_list<boost::listS, boost::vecS, boost::undirectedS,
        boost::no_property, boost::property<boost::edge_weight_t, int> > Graph;

#define rep(i,n) for(int i=0;i<(n);++i)
#define reps(i,n) for(int i=1;i<=(n);++i)
#define all(x) (x).begin(),(x).end()
#define Fixed fixed << setprecision(12)
#define bsort boost::sort::spreadsort::spreadsort
#define int int_fast64_t
using pii = pair<int,int>;

constexpr int INF  = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr int mod1 = 1e9+7; 
constexpr int mod2 = 998244353;
template <class Func>

class FixPoint : Func {
public:
    explicit constexpr FixPoint(Func&& f) noexcept : Func(forward<Func>(f)) {}
 
    template <class... Args>
    constexpr decltype(auto) operator()(Args&&... args) const {
        return Func::operator()(*this, std::forward<Args>(args)...);
    }
};
 
template <class Func>
static inline constexpr decltype(auto) makeFixPoint(Func&& f) noexcept {
    return FixPoint<Func>{forward<Func>(f)};
}

template <class A, class B> inline bool chmax(A &a, const B &b) { return b > a && (a = b, true); }
template <class A, class B> inline bool chmin(A &a, const B &b) { return b < a && (a = b, true); }

template <class T> using min_heap = priority_queue<T,vector<T>,greater<T> >;
template <class T> using max_heap = priority_queue<T>;
template <class A, class B> using umap = unordered_map<A,B>;

template <typename T> using Set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template <typename K, typename V> using Umap = gp_hash_table<K, V>;
using Trie = trie<string, null_type, trie_string_access_traits<>, pat_trie_tag, trie_prefix_search_node_update>;
  
inline int square(int a){ return a * a;}
inline int updiv(int a,int b){ return (a + b - 1) / b; }

constexpr int dx[] = {1,0,-1,0,1,1,-1,-1};
constexpr int dy[] = {0,-1,0,1,1,-1,-1,1};

constexpr int dxw[] = {-2, -1, 0, 1, 2, -2, -1, 1, 2, -2, 2, -2, -1, 1, 2, -2, -1, 0, 1, 2};
constexpr int dyw[] = {-2, -2, -2, -2, -2, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2};

struct negrightshift {
    inline int operator() (const int &x, const unsigned offset) {
        return -(x >> offset);
    }
};
//}}}

//UnionFind{{{
struct UnionFind {
    vector< int > data;
 
    UnionFind(int sz) {
        data.assign(sz, -1);
    }
 
    bool unite(int x, int y) {
        x = find(x), y = find(y);
        if(x == y) return (false);
        if(data[x] > data[y]) swap(x, y);
        data[x] += data[y];
        data[y] = x;
        return (true);
    }
 
    int find(int k) {
        if(data[k] < 0) return (k);
        return (data[k] = find(data[k]));
    }
 
    int size(int k) {
        return (-data[find(k)]);
    }

    bool same(int x, int y) {
        return (find(x) == find(y));
    }
};
//}}}


signed main(){
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    cout.setf(ios_base::fixed);
    cout.precision(10);

    int n, m;
    cin >> n >> m;

    UnionFind uf(n);

    rep(i,m){
        int a, b;
        cin >> a >> b;
        --a, --b;
        uf.unite(a, b);
    }

    int res = 0;
    rep(i,n){
        chmax(res, uf.size(i));
    }

    cout << res << '\n';

    return 0;
}

Measured memory_bytes: 4768