public static void main ( String [ ] args ) throws IOException {
  int [ ] firstLineInput = Arrays . stream ( br . readLine ( ) . split ( " " ) ) . mapToInt ( Integer :: parseInt ) . toArray ( ) ;
  int n = firstLineInput [ 0 ] ;
  int k = firstLineInput [ 1 ] ;
  int timeRemaining = 240 - k ;
  int sum = 0 ;
  int i = 0 ;
  for ( i = 1 ;
  i <= n ;
  i ++ ) {
    sum += 5 * i ;
    if ( sum > timeRemaining ) {
      break ;
    }
  }
  System . out . println ( i - 1 ) ;
}

public static void main ( String [ ] args ) throws IOException { int [ ] firstLineInput = Arrays . stream ( br . readLine ( ) . split ( " ▁ " ) ) . mapToInt ( Integer :: parseInt ) . toArray ( ) ; int n = firstLineInput [ 0 ] ; int k = firstLineInput [ 1 ] ; int timeRemaining = 240 - k ; int sum = 0 ; int i = 0 ; for ( i = 1 ; i <= n ; i ++ ) { sum += 5 * i ; if ( sum > timeRemaining ) { break ; } } System . out . println ( i - 1 ) ; }
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