pr2divide

#include <iostream>
using namespace std;
int v[100],k=0,n;
void f(int li,int ls)
{
int lm;
if(li==ls) {if(v[li]%2==0) k++;}
else
{
lm=(li+lm)/2;
f(li,lm);
f(lm+1,ls);
}
}
main()
{
int i;
cin>>n;
for(i=1;i<=n;i++) cin>>v[i];
f(1,n);
cout<<k;
}