#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,m,a[1005],b[1005],sum,l=1,r=1;
signed main(){
	cin>>m>>n;
	for(int i=1;i<=n;i++){
		bool flag=0;
		cin>>a[i];
		for(int j=l;j<=r;j++){
			if(b[j]==a[i]){
				flag=1;
				break;
			}
		}
		if(flag==0){
			b[r++]=a[i];
			if(r-l>=m) l++;
			sum++;
		}
	}
	cout<<sum;
    return 0;
}