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#include <bits/stdc++.h>
#define NMAX 100
using namespace std;
ifstream fin ("dfs.in");
ofstream fout ("dfs.out");
queue < int > Coada;
int n,m,nc,maxi=INT_MIN;
int adi[NMAX+5][NMAX+5],viz[NMAX+5];
void dfs(int i)
{
nc=1;
Coada.push(i);
viz[i]=nc;
while(!Coada.empty())
{
int nodcurent=Coada.front();
Coada.pop();
for(int j=1;j<=n;j++)
if(adi[nodcurent][j] && !viz[j])
{
Coada.push(j);
nc++;
viz[j]=nc;
}
}
}
int main()
{
fin >> n >> m;
for(int i=1;i<=m;i++)
{
int x,y;
fin >> x >> y;
adi[x][y]=1;
adi[y][x]=1;
}
for(int i=1;i<=n;i++)
{
if(!viz[i])
{
dfs(i);
}
}
for(int i=1;i<=n;i++)
if(maxi<viz[i])maxi=viz[i];
fout << maxi;
return 0;
}