#include <iostream>
#include <iosfwd>
#include <iomanip>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <cassert>
#include <cctype>
#include <climits>
#include <vector>
#include <bitset>
#include <set>
#include <queue>
#include <math.h>
#include <stack>
#include <map>
#include <deque>
#include <string>
#include <list>
#include <iterator>
#include <sstream>
#include <complex>
#include <fstream>
#include <functional>
#include <numeric>
#include <utility>
#include <algorithm>
#include <assert.h>
#include <unordered_map>
#pragma GCC optimize ("-O3")
using namespace std;
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); cerr.tie(NULL);
#define tolower(s) transform(s.begin(),s.end(),s.begin(),::tolower);
#define toupper(s) transform(s.begin(),s.end(),s.begin(),::toupper);
#define ll long long int
ll max(ll a, ll b) {  return a > b ? a : b; }
ll gcd(ll a, ll b) { if (a == 0) { return b; } return b == 0 ? a : gcd(b, a % b);}
#define case(i) cout<<"Case #"<<i<<": ";
#define debug(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); cerr << '\n'; }
void err(istream_iterator<string> it) {}
template<typename T, typename... Args>
#define debug2(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
void err(istream_iterator<string> it, T a, Args... args) { cerr << "[ " << *it << " = " << a << " ]"; err(++it, args...);}
#define time__(d) for (auto blockTime = make_pair(chrono::high_resolution_clock::now(), true); blockTime.second; debug2("%s: %lld ms\n", d, chrono::duration_cast<chrono::milliseconds>(chrono::high_resolution_clock::now() - blockTime.first).count()), blockTime.second = false)
#define pii pair <ll , ll >
#define pb push_back
#define PRECISION 10
const ll inf = 9223372036854775800;
const int MAXN = 200001;
const int LOGN = 22;
const int MAXBIT = 62;
const long double PI = 3.141592653589793;
const int DIGITSIZE = 18;
ll mod = 1e9 + 7;
ll MOD = 998244353;
int x4[] = {1, -1, 0, 0};
int y4[] = {0, 0, 1, -1};
int x8[] = {1, 1, 1, -1, -1, -1, 0, 0};
int y8[] = {1, 0, -1, 1, 0, -1, 1, -1};
bool takeTestCases = 0;
bool printCaseNo = 0;

ll dsu[MAXN];
ll size1[MAXN];
void initialize(int n) {
	for (int i = 0; i <= n; i++) {
		dsu[i] = i;
		size1[i] = 1;
	}
}
int getroot(int i) {

	while (dsu[i] != i) {
		dsu[i] = dsu[dsu[i]];
		i = dsu[i];
	}
	return i;
}
void _union(int i, int j) {
	int x = getroot(i);
	int y = getroot(j);
	if (x == y) {
		return ;
	}
	else {
		if (size1[x] > size1[y]) {
			size1[y] += size1[x];
			dsu[x] = dsu[y];
			size1[x] = 0;
		}
		else {
			size1[x] += size1[y];
			size1[y] = 0;
			dsu[y] = dsu[x];
		}
	}
}
void getac(int T) {
	int n, m;
	cin >> n >> m;
	initialize(n);
	for (int i = 0; i < m; i++) {
		int x, y;
		cin >> x >> y;
		_union(x, y);
	}
	int ans = 0;
	for (int i = 0; i < n; i++) {
		ans = max(ans, size1[getroot(i)]);
	}
	cout << ans << '\n';
}
int  main()
{

	fastio;
	int t = 1;
	if (takeTestCases) { cin >> t; }
	int t_t = 1;
	while (t--) {
		if (printCaseNo)
		case (t_t);
		getac(t_t);
		t_t++;
	}
	cerr << "Total time elapsed :" << clock() * 1000.0 / CLOCKS_PER_SEC << " ms" << '\n';
	return 0;
}


Measured memory_bytes: 6952