 
import std.stdio, std.conv, std.string, std.array, std.range, std.algorithm, std.container;
import std.math, std.random, std.bigint, std.datetime, std.format;
void main(string[] args){ if(args.length > 1) if(args[1] == "-debug") DEBUG = 1; solve(); } bool DEBUG = 0; 
void log(A ...)(lazy A a){ if(DEBUG) print(a); }
void print(){ writeln(""); } void print(T)(T t){ writeln(t); } void print(T, A ...)(T t, A a){ write(t, " "), print(a); }
string unsplit(T)(T xs){ return xs.array.to!(string[]).join(" "); }
string scan(){ static string[] ss; while(!ss.length) ss = readln.chomp.split; string res = ss[0]; ss.popFront; return res; }
T scan(T)(){ return scan.to!T; } T[] scan(T)(int n){ return n.iota.map!(i => scan!T()).array; }
T lowerTo(T)(ref T x, T y){ if(x > y) x = y; return x; } T raiseTo(T)(ref T x, T y){ if(x < y) x = y; return x; }

// ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- //

void solve(){
  int n = scan!int, m = scan!int;
  auto uf = new UnionFind(n);
  foreach(j; 0 .. m){
    int a = scan!int - 1, b = scan!int - 1;
    uf.unite(a, b);
  }
  int ans = 0;
  foreach(i; 0 .. n){
    ans.raiseTo(uf.getSize(i));
  }
  ans.writeln;
}
import std.conv;
class UnionFind{
    int[] rootOf;
    int[][] kidsOf;
    this(int n){
        rootOf = new int[](n);
        kidsOf = new int[][](n);
        foreach(i; 0 .. n) rootOf[i] = i, kidsOf[i] = [i];
    }
    void unite(int a, int b){
        int ra = rootOf[a], rb = rootOf[b];
        if(ra == rb) return;
        if(kidsOf[ra].length < kidsOf[rb].length) unite(b, a);
        else foreach(k; kidsOf[rb]) rootOf[k] = ra, kidsOf[ra] ~= k;
    }
    int find(int a){
        return rootOf[a];
    }
    int getSize(int a){
        return kidsOf[rootOf[a]].length.to!int;
    }
}