// اَللَهُمَ صَلِ عَلَىَ مُحَمَدٍ وَ آلِ مُحَمَدٍ
#include "bits/stdc++.h"
using namespace std ;
#define int long long
#define pb push_back
#define si size()
#define fi first
#define se second
#define all(a) a.begin(),a.end()
#define applejuice ios::sync_with_stdio(false) ; cin.tie(nullptr) ; cout.tie(nullptr) ;
const int inf=1e18 ;
const int mod=1e9+7 ;
int tt=1 ;
map<int,bool> mp ;
void solve()
{
int n , q , sum=0 ;
cin >> n >> q ;
while(q--)
{
int x ;
cin >> x ;
if(mp[x]==1) {sum+=1 ; mp.clear() ;}
mp[x]=1 ;
}
cout << sum ;
}
signed main()
{
//wrong
applejuice ;
//cin >> tt ;
while(tt--) {solve() ;}
}
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