#include <bits/stdc++.h>
using namespace std;
signed main()
{
int k,n;
cin>>k>>n;
vector <int> a(n+1);
for(int i=1;i<=n;i++){
cin>>a[i];
}
map <int,int> mp;
int cnt=0,d=0;
for(int i=1;i<=n;i++){
if(a[i]<0) mp[a[i]]++;
else mp[a[i]]--;
}
int sum=0;
for(int i=1;i<k-1;i++){
sum+=abs(mp[a[i]]-mp[a[i+1]]);
}
cout<<n-1;
}
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