#include <iostream>

using namespace std;

int subtract (int a,int b)
{
    int subtraction=a-b;
    return subtraction;
}

int main()
{
    int magicsquare[5][5]={0};
    int i,j,n,k,zbir=0,zrazlika=0,tval=0;
    cin>>n;
    for (i=0;i<n;i++)
    {
        for (j=0;j<n;j++)
        {
            cin>>magicsquare[i][j];
        }
    }

        for (i=0;i<n;i++)
    {
        for (j=0;j<n;j++)
        {
            if (magicsquare[i][j]==-1)
            {
                if (i>=0 and i<n-1)
                {
                    for (k=0;k<n;k++)
                    {
                        zbir+=magicsquare[i+1][k];
                        zrazlika+=magicsquare[i][k];
                    }
                    zrazlika+=1;
                    tval=1;
                    break;
                } else
                {
                    for (k=0;k<n;k++)
                    {
                        zbir+=magicsquare[i-1][k];
                        zrazlika+=magicsquare[i][k];
                    }
                    zrazlika+=1;
                    tval=1;
                    break;

                }
            }
            if (tval==1) break; else continue;
        }
        if (tval==1) break; else continue;
    }

    int field=subtract(zbir,zrazlika);
    cout<<field;

    return 0;
}