C++ :

#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
	//freopen("translate.in","r",stdin);
	//freopen("translate.ans","w",stdout);
	bool b;
	int a[101],c=0,i,j,k,l=1,m,n;
	ios::sync_with_stdio(false);
	cin>>n>>m;
	for(i=1;i<=n;i++)
		a[i]=-1;
	for(i=1;i<=m;i++)
	{
		b=1;
		cin>>j;
		for(k=1;k<=n;k++)
			if(a[k]==j)
			{
				b=0;
				break;
			}
		if(b)
		{
			c++;
			a[l++]=j;
			if(l==n+1)
				l=1;
		}
	}
	cout<<c;
	return 0;
}