#include <fstream>
using namespace std;
int A[305][305];
int main()
{
    ifstream fin("grozavesti.in");
    ofstream fout("grozavesti.out");
    int n, i, j, k=0;
    fin >> n;
    for(i=1;i<=n;++i)
        for(j=1;j<=n;++j)
            fin >> A[i][j];
    for(i=1;i<=n-1;++i)
        if(A[i][i]>A[i+1][i+1]) k=1;
    if(k=0) fout << 0;
    return 0;
}