#include <stdio.h>

int s,a[100][100],i,j,n,min=32000;

int main()
{
	FILE *f,*g;

	f=fopen("cc.in","r");

	g=fopen("cc.out","w");

	fscanf(f,"%d",&n);

	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			fscanf(f,"%d",&a[i][j]);

	for(i=1;i<=n;i++)
	{
		min=32000;

		for(j=1;j<=n;j++)
		{
			if(a[i][j]<min)  min=a[i][j];
		}
		s+=min;
	}

	fprintf(g,"%d",s);

	return 0;
}