public static void main ( String [ ] args ) throws IOException {
  BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ;
  StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ;
  int p = Integer . parseInt ( st . nextToken ( ) ) ;
  int x = Integer . parseInt ( st . nextToken ( ) ) ;
  int y = Integer . parseInt ( st . nextToken ( ) ) ;
  for ( int i = x ;
  i >= y ;
  i -= 50 ) {
    if ( winTshirt ( i , p ) ) {
      System . out . println ( 0 ) ;
      return ;
    }
  }
  int counter = 0 ;
  while ( true ) {
    counter ++ ;
    x += 100 ;
    if ( x < y ) continue ;
    if ( winTshirt ( x , p ) ) {
      break ;
    }
    if ( x - 50 >= y && winTshirt ( x - 50 , p ) ) {
      break ;
    }
  }
  System . out . println ( counter ) ;
}

public static void main ( String [ ] args ) throws IOException { BufferedReader br = new BufferedReader ( new InputStreamReader ( System . in ) ) ; StringTokenizer st = new StringTokenizer ( br . readLine ( ) ) ; int p = Integer . parseInt ( st . nextToken ( ) ) ; int x = Integer . parseInt ( st . nextToken ( ) ) ; int y = Integer . parseInt ( st . nextToken ( ) ) ; for ( int i = x ; i >= y ; i -= 50 ) { if ( winTshirt ( i , p ) ) { System . out . println ( 0 ) ; return ; } } int counter = 0 ; while ( true ) { counter ++ ; x += 100 ; if ( x < y ) continue ; if ( winTshirt ( x , p ) ) { break ; } if ( x - 50 >= y && winTshirt ( x - 50 , p ) ) { break ; } } System . out . println ( counter ) ; }
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