public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  while ( sc . hasNext ( ) ) {
    String source = sc . nextLine ( ) ;
    int n = 0 ;
    int e = 0 ;
    int i = 0 ;
    int t = 0 ;
    for ( int j = 0 ;
    j < source . length ( ) ;
    j ++ ) {
      if ( source . charAt ( j ) == 'n' ) {
        n ++ ;
      }
      if ( source . charAt ( j ) == 'e' ) {
        e ++ ;
      }
      if ( source . charAt ( j ) == 't' ) {
        t ++ ;
      }
      if ( source . charAt ( j ) == 'i' ) {
        i ++ ;
      }
    }
    n = ( n - 1 ) / 2 ;
    e /= 3 ;
    int min1 = Math . min ( n , e ) ;
    int min2 = Math . min ( i , t ) ;
    int min = Math . min ( min1 , min2 ) ;
    System . out . println ( min ) ;
  }
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; while ( sc . hasNext ( ) ) { String source = sc . nextLine ( ) ; int n = 0 ; int e = 0 ; int i = 0 ; int t = 0 ; for ( int j = 0 ; j < source . length ( ) ; j ++ ) { if ( source . charAt ( j ) == ' n ' ) { n ++ ; } if ( source . charAt ( j ) == ' e ' ) { e ++ ; } if ( source . charAt ( j ) == ' t ' ) { t ++ ; } if ( source . charAt ( j ) == ' i ' ) { i ++ ; } } n = ( n - 1 ) / 2 ; e /= 3 ; int min1 = Math . min ( n , e ) ; int min2 = Math . min ( i , t ) ; int min = Math . min ( min1 , min2 ) ; System . out . println ( min ) ; } }
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