public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int i = 0 ;
  int a = 0 , b = 0 , c = 0 ;
  while ( i <= n ) {
    a += sc . nextInt ( ) ;
    i ++ ;
    if ( i == n ) break ;
    b += sc . nextInt ( ) ;
    i ++ ;
    if ( i == n ) break ;
    c += sc . nextInt ( ) ;
    i ++ ;
    if ( i == n ) break ;
  }
  if ( a > b && a > c ) System . out . println ( "chest" ) ;
  if ( b > a && b > c ) System . out . println ( "biceps" ) ;
  if ( c > a && c > b ) System . out . println ( "back" ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int i = 0 ; int a = 0 , b = 0 , c = 0 ; while ( i <= n ) { a += sc . nextInt ( ) ; i ++ ; if ( i == n ) break ; b += sc . nextInt ( ) ; i ++ ; if ( i == n ) break ; c += sc . nextInt ( ) ; i ++ ; if ( i == n ) break ; } if ( a > b && a > c ) System . out . println ( " chest " ) ; if ( b > a && b > c ) System . out . println ( " biceps " ) ; if ( c > a && c > b ) System . out . println ( " back " ) ; }
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