static int maxPeople ( int p ) {
  long [ ] sums = new long [ kN ] ;
  sums [ 0 ] = 0 ;
  for ( int i = 1 ;
  i < kN ;
  i ++ ) sums [ i ] = ( long ) ( i * i ) + sums [ i - 1 ] ;
  int it = lower_bound ( sums , 0 , kN , p ) ;
  if ( it > p ) {
    -- it ;
  }
  return it ;
}

static int maxPeople ( int p ) { long [ ] sums = new long [ kN ] ; sums [ 0 ] = 0 ; for ( int i = 1 ; i < kN ; i ++ ) sums [ i ] = ( long ) ( i * i ) + sums [ i - 1 ] ; int it = lower_bound ( sums , 0 , kN , p ) ; if ( it > p ) { -- it ; } return it ; }
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