public static void main ( String [ ] args ) {
  Scanner in = new Scanner ( System . in ) ;
  String trains [ ] = {
    "chest" , "biceps" , "back" };
    int n = in . nextInt ( ) ;
    int arr [ ] = new int [ n ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) arr [ i ] = in . nextInt ( ) ;
    int sum [ ] = new int [ 3 ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      sum [ i % 3 ] += arr [ i ] ;
    }
    int maxI = 0 ;
    for ( int i = 1 ;
    i < sum . length ;
    i ++ ) if ( sum [ i ] > sum [ maxI ] ) maxI = i ;
    System . out . println ( trains [ maxI ] ) ;
  }
  
public static void main ( String [ ] args ) { Scanner in = new Scanner ( System . in ) ; String trains [ ] = { " chest " , " biceps " , " back " } ; int n = in . nextInt ( ) ; int arr [ ] = new int [ n ] ; for ( int i = 0 ; i < n ; i ++ ) arr [ i ] = in . nextInt ( ) ; int sum [ ] = new int [ 3 ] ; for ( int i = 0 ; i < n ; i ++ ) { sum [ i % 3 ] += arr [ i ] ; } int maxI = 0 ; for ( int i = 1 ; i < sum . length ; i ++ ) if ( sum [ i ] > sum [ maxI ] ) maxI = i ; System . out . println ( trains [ maxI ] ) ; }
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