# include <math.h>
# include <stdio.h>
# include <stdlib.h>

int main ( int argc, char *argv[] )
{
  double e;
  double h;
  int i;
  int n;
  double q;
  double x;

  n = atoi ( argv[1] );

  h = 1.0 / ( double ) n;

  q = 0.0;
  for ( i = 0; i < n; i++ )
  {
    x = ( double ) ( i ) / ( double ) ( n );
    q = q + h * 1.0 / ( x + 1.0 );
  }
  e = fabs ( q - log ( 2.0 ) );
  printf ( "  %6d  %14.6g  %10.2e\n", n, q, e );

  return 0;
}