static int MinimumX ( int a , int b , int c , int k ) {
  int x = Integer . MAX_VALUE ;
  if ( k <= c ) return 0 ;
  int h = k - c ;
  int l = 0 ;
  while ( l <= h ) {
    int m = ( l + h ) / 2 ;
    if ( ( a * m * m ) + ( b * m ) > ( k - c ) ) {
      x = Math . min ( x , m ) ;
      h = m - 1 ;
    }
    else if ( ( a * m * m ) + ( b * m ) < ( k - c ) ) l = m + 1 ;
    else return m ;
  }
  return x ;
}

static int MinimumX ( int a , int b , int c , int k ) { int x = Integer . MAX_VALUE ; if ( k <= c ) return 0 ; int h = k - c ; int l = 0 ; while ( l <= h ) { int m = ( l + h ) / 2 ; if ( ( a * m * m ) + ( b * m ) > ( k - c ) ) { x = Math . min ( x , m ) ; h = m - 1 ; } else if ( ( a * m * m ) + ( b * m ) < ( k - c ) ) l = m + 1 ; else return m ; } return x ; }
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