#include <iostream>

using namespace std;

const int NMAX = 1024;

struct PAIR {
    int x,y;
};

PAIR sol[NMAX+2];
int N, v[NMAX+2][NMAX+2];
int tt[NMAX+2], gr[NMAX+2];

int root( int x ) {
    if ( tt[x] == x )  return x;
    else  return ( tt[x] = findy( tt[x] ) );
}

citire_init() {
    in >> N;
    for( int i= 1;  i<N;  ++i ) {
        tt[i]= i;   gr[i]= 1;
        for( int j= i+1;  j<=N;  ++j )  in >> v[i][j];
    }
}

int main() {
    citire_init();