/*
TASK:oldmap
LANG:C
*/
#include <stdio.h>
#include <stdlib.h>
//#include <time.h>

 int n,m;
 int a[501][501];
 int pom;

 int main ()
  {
   int i,j,k;
//   clock();
   scanf("%d",&n);
   for (i=1;i<=n;i++)
    for (j=1;j<=n;j++)
     scanf("%d",&a[i][j]);
   for (k=1;k<=n;k++)
    for (i=1;i<=n;i++)
     for (j=1;j<=n;j++)
      if (i!=j)
       {
        pom=a[i][k]+a[k][j];
        if (a[i][j]>pom) a[i][j]=pom;
       }
   for (i=1;i<=n;i++)
    for (j=i+1;j<=n;j++)
     printf("%d %d %d\n",i,j,a[i][j]);
 //  printf("%lf\n",(double)clock()/(double)CLOCKS_PER_SEC);
   return 0;
  }

