#include <stdio.h>
long a[301][301];
int main()
{
freopen("grozaves.in","r",stdin);
freopen("grozaves.out","w",stdout);
int n;
scanf("%d",&n);
int i,j;
for (i=1;i<=n;i++)
for (j=1;j<=n;j++)scanf("%d",&a[i][j]);
int adev=0;
for (i=2;i<=n;i++) if ( a[i-1][i-1]<a[i][i]) adev=1;
if (!adev){ printf("0"); return 0;}
return 0;
}