#include<bits/stdc++.h>
#define ll long long
#define co cout<<
using namespace std;
// stuff
void solve(){
ll n,q;
cin>>n>>q;
ll f[n+5]={},p=1;
while(q--){
ll x;
cin>>x;
p+=(f[x]==p);
f[x]=p;
}
co p-1;
}
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int _=1;
// cin>>_;
while(_--) solve();
}
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