public static void main ( String args [ ] ) {
  FScanner in = new FScanner ( ) ;
  PrintWriter out = new PrintWriter ( System . out ) ;
  int n = in . nextInt ( ) ;
  int xsum = 0 , ysum = 0 , zsum = 0 ;
  while ( n -- > 0 ) {
    xsum = xsum + in . nextInt ( ) ;
    ysum = ysum + in . nextInt ( ) ;
    zsum = zsum + in . nextInt ( ) ;
  }
  if ( xsum == 0 && ysum == 0 && zsum == 0 ) out . println ( "YES" ) ;
  else out . println ( "NO" ) ;
  out . close ( ) ;
}

public static void main ( String args [ ] ) { FScanner in = new FScanner ( ) ; PrintWriter out = new PrintWriter ( System . out ) ; int n = in . nextInt ( ) ; int xsum = 0 , ysum = 0 , zsum = 0 ; while ( n -- > 0 ) { xsum = xsum + in . nextInt ( ) ; ysum = ysum + in . nextInt ( ) ; zsum = zsum + in . nextInt ( ) ; } if ( xsum == 0 && ysum == 0 && zsum == 0 ) out . println ( " YES " ) ; else out . println ( " NO " ) ; out . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (type_identifier) name: (identifier) dimensions: (dimensions))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list)))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal)) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (update_expression (identifier)) right: (decimal_integer_literal))) body: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (string_literal))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))