#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("bac.txt");

int main()
{
    int n,x,l=0,c=0;
    fin>>n;
    while(fin>>x)
    {
        if(x%2==0) l++;
        else
        {
            if(l>=2) c++;
            l=0;
        }
    }
    if(l>=2) c++;//pt ultimele
    cout<<c;
    return 0;
}