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#include <iostream>

using namespace std;
int tab[50009];

int main()
{
    ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    int wy=0,ilo=1;
    for(int i=1;i<=n;i++){
        cin>>tab[i];
        if(tab[i]==tab[i-1]){
            ilo++;
            if(ilo%2==0)wy++;
        }
        else ilo=1;
    }
    cout<<wy<<endl;

    return 0;
}