#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
#define pb push_back
signed main(){
int n,q;
cin>>n>>q;
vector <int> a(q);
int cnt = 0;
for(int i = 0;i < q;i++){
cin>>a[i];
if(i > 0){
if(a[i - 1] == a[i] && a[i] > 0)cnt ++;
}
}
cout<<cnt<<'\n';
}
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