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#include <fstream>
int a[100005];
long long n;
using namespace std;
int main()
{
int i,contor;
ifstream fin ("and.in");
ofstream fout ("and.out");
fin>>n;
a[1]=1;
contor=0;
for(i=1;i<=n;i++)
fin>>a[i];
for(i=1;i<=n;i++)
if(a[i] & a[i+1]!=0){a[i+1]=a[i+2];contor++;}
else a[i]=a[i+1];
fout<<contor;
fin.close();
fout.close();
return 0;
}