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#include <fstream>
using namespace std;
ifstream f("labirint.in");
ofstream g("labirint.out");
int n,v[101], i, m, j;
int main()
{
f>>n;
for(i=1; i<=n*n; i++)
f>>v[i];
m=v[1];
for(i=2; i<=n; i++)
for(j=1; j<=i*2+1; j++)
{
if(i%2==1 && j%2==1 || i%2==0 && j%2==0)
m=m+v[i+j];
if(i%2==0 && j%2==1 || i%2==1 && j%2==0)
if(v[j-1]>v[j+1])
m=m+v[j+1];
else
m=m+v[j-1];
}
g<<m;
return 0;
}