#include<iostream>
#include<fstream>
#include<limits>
using namespace std;
int main()
{ifstream f("grupuri.in");
ofstream g("grupuri.out");
long k,n,a[100000],i,s,z,v[100000][100000],j;
f>>k;
f>>n;
for(i=1;i<=n;i++)
	f>>a[i];
s=0;
for(i=1;i<=n;i++)
	s=s+a[i];
s=s/k;
z=1;
g<<s;
for(i=1;i<=s;i++)
	{for(j=1;j<=k;j++)
		if(a[z]==v[i][j-1])
			z++;
		else v[i][j]=a[z];
	z++;}
f.close();
g.close();
return 0;
}