#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

#define CIN( LL , A ) LL A; cin >> A 
#define FOR( VAR , INITIAL , FINAL_PLUS_ONE ) for( remove_const<remove_reference<decltype( FINAL_PLUS_ONE )>::type >::type VAR = INITIAL ; VAR < FINAL_PLUS_ONE ; VAR ++ ) 
#define QUIT return 0 
#define RETURN( ANSWER ) cout << ( ANSWER ) << "\n"; QUIT 

#include <cassert>

#define MAIN main

int main()
{
  constexpr const int bound = 31;
  CIN( int , N );
  assert( N < bound );
  int T[bound][bound];
  FOR( i , 0 , N ){
    int ( &Ti )[bound] = T[i];
    FOR( j , 0 , N ){
      cin >> Ti[j];
      assert( Ti[j] < bound );
    }
  }
  FOR( n0 , 0 , N ){
    int ( &Tn0 )[bound] = T[n0];
    FOR( n1 , 0 , N ){
      int& Tn0n1 = Tn0[n1];
      int ( &Tn1 )[bound] = T[n1];
      FOR( n2 , 0 , N ){
	if( T[Tn0n1][n2] != Tn0[Tn1[n2]] ){
	  RETURN( "NO" );
	}
      }
    }
  }
  bool unit;
  FOR( e , 0 , N ){
    int ( &Te )[bound] = T[e];
    unit = true;
    FOR( n , 0 , N ){
      if( Te[n] != n ){
	unit = false;
	break;
      } else if( T[n][e] != n ){
	unit = false;
	break;
      }
    }
    if( unit ){
      FOR( n , 0 , N ){
	int ( &Tn )[bound] = T[n];
	unit = false;
	FOR( i , 0 , N ){
	  if( Tn[i] == e && T[i][n] == e ){
	      unit = true;
	      break;
	  }
	}
	if( ! unit ){
	  break;
	}
      }
      if( unit ){
	RETURN( "YES" );
      }
    }
  }
  RETURN( "NO" );
}