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#include <bits/stdc++.h>
using namespace std;
int jd;
int main(){
int a;
int tab[a];
cin >> a;
int b= a/10;
for(int i=0; i<a; i+=b)
 {
 cin >> tab[i];
if(tab[i] == tab[i+1])
{
tab[i] = 'N';
tab[i-1] = 'N';
jd++;
}
 }
cout << jd;
}