public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  String str = input . nextLine ( ) ;
  int [ ] freq = new int [ 4 ] ;
  Arrays . fill ( freq , 0 ) ;
  for ( int i = 0 ;
  i < str . length ( ) ;
  i ++ ) {
    switch ( str . charAt ( i ) ) {
      case 'n' : freq [ 0 ] ++ ;
      break ;
      case 'i' : freq [ 1 ] ++ ;
      break ;
      case 'e' : freq [ 2 ] ++ ;
      break ;
      case 't' : freq [ 3 ] ++ ;
      break ;
      default : break ;
    }
  }
  if ( freq [ 0 ] < 3 || freq [ 1 ] < 1 || freq [ 2 ] < 3 || freq [ 3 ] < 1 ) {
    System . out . println ( 0 ) ;
    return ;
  }
  int ans = 0 ;
  if ( freq [ 0 ] >= 3 && freq [ 1 ] >= 1 && freq [ 2 ] >= 3 && freq [ 3 ] >= 1 ) {
    freq [ 0 ] -- ;
  }
  while ( ( freq [ 0 ] >= 2 && ( freq [ 0 ] % 3 <= 2 ) ) && freq [ 1 ] >= 1 && freq [ 2 ] >= 3 && freq [ 3 ] >= 1 ) {
    freq [ 0 ] -= 2 ;
    freq [ 1 ] -- ;
    freq [ 2 ] -= 3 ;
    freq [ 3 ] -- ;
    ans ++ ;
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; String str = input . nextLine ( ) ; int [ ] freq = new int [ 4 ] ; Arrays . fill ( freq , 0 ) ; for ( int i = 0 ; i < str . length ( ) ; i ++ ) { switch ( str . charAt ( i ) ) { case ' n ' : freq [ 0 ] ++ ; break ; case ' i ' : freq [ 1 ] ++ ; break ; case ' e ' : freq [ 2 ] ++ ; break ; case ' t ' : freq [ 3 ] ++ ; break ; default : break ; } } if ( freq [ 0 ] < 3 || freq [ 1 ] < 1 || freq [ 2 ] < 3 || freq [ 3 ] < 1 ) { System . out . println ( 0 ) ; return ; } int ans = 0 ; if ( freq [ 0 ] >= 3 && freq [ 1 ] >= 1 && freq [ 2 ] >= 3 && freq [ 3 ] >= 1 ) { freq [ 0 ] -- ; } while ( ( freq [ 0 ] >= 2 && ( freq [ 0 ] % 3 <= 2 ) ) && freq [ 1 ] >= 1 && freq [ 2 ] >= 3 && freq [ 3 ] >= 1 ) { freq [ 0 ] -= 2 ; freq [ 1 ] -- ; freq [ 2 ] -= 3 ; freq [ 3 ] -- ; ans ++ ; } System . out . println ( ans ) ; }
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name: (identifier) arguments: (argument_list (identifier) (decimal_integer_literal)))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (switch_expression condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) body: (switch_block (switch_block_statement_group (switch_label (character_literal)) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (break_statement)) (switch_block_statement_group (switch_label (character_literal)) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (break_statement)) (switch_block_statement_group (switch_label (character_literal)) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (break_statement)) (switch_block_statement_group (switch_label (character_literal)) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (break_statement)) (switch_block_statement_group (switch_label) (break_statement)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)))) consequence: (block (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (return_statement))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)))) consequence: (block (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (binary_expression left: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)) right: (decimal_integer_literal))))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) right: (binary_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal)))) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (decimal_integer_literal)) right: (decimal_integer_literal))) (expression_statement (update_expression (array_access array: (identifier) index: (decimal_integer_literal)))) (expression_statement (update_expression (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))