#include <iostream>
using namespace std;
int main()
{
int a[100][100],i,j,n,s=0;
cin>>n;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++){
cin>>a[i][j];
if(i==j && a[i][j]%2==0)
s=s+a[i][j];
}
cout<<"suma numerelor pozitive de pe diagonala este="<<s;
return 0;
}