#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long
#define endl "\n"
#define ull unsigned long long
//priority_queue<int,vector<int>,greater<int> >head;//(队列专用)
queue<int> q;
int ans;
int n,a,k,cz;
int main(){
	ios;
	cin>>k>>n;
	ans=n;
	for(int i=1;i<=n;i++){
		cin>>a;
		if(q.size()<k){//没有满 
			for(int j=1;j<=q.size();j++){//查找 
				if(q.front()!=a){//没查到 
					q.push(q.front());
					q.pop();
				}
				else {//查到了 
					ans--;
					cz=1;
				}
			}
			if(cz!=1){//如果没查到 
				q.push(a);
				continue;
			}
			else{//如果查到了 
				cz=0;
				continue;
			}
		}
		else{//满了 
	    	for(int j=1;j<=k;j++){//查找 
				if(q.front()!=a){//没查到 
					q.push(q.front());
					q.pop();
				}
				else {//查到了 
					ans--;
					cz=1;
					q.push(q.front());
					q.pop();
				}
			}
			if(cz!=1){//如果没查到 
				q.pop();
				q.push(a);
				continue;
			}
			else{//如果查到了 
				cz=0;
				continue;
			}
		}
	}
	cout<<ans;
	return 0;
}

#1，#4 AC，样例未过，求调