#include <cstdio>
#include <algorithm>
#include <ctime>
#include <cstdlib>
#define maxn 128
using namespace std;

int x[maxn][maxn], n;

void citire()
{
  freopen("cc.in", "r", stdin);
  scanf("%d\n", &n);
  int i, j;
  for(i=1;i<=n;i++)
    for(j=1;j<=n;j++) scanf("%d ", &x[i][j]);
}

void solve()
{
  int i, j, ntimes=10000;
  int a[maxn], sum=0, smin=0x3f3f3f3f;
  for(i=1;i<=n;i++) a[i]=i;

  for(i=0;i<ntimes;i++)
    {
      random_shuffle(a+1,a+n+1);
      sum=0;
      for(j=1;j<=n;j++)sum+=x[j][a[j]];
      if(smin>sum) smin=sum;
    }
freopen("cc.out", "w", stdout); 
 printf("%d\n", smin);
}

int main()
{
  time_t s;
  time(&s);
  srand(s%666013);
  citire();
  solve();
  return 0;
}