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

int
main (int argc, char *argv[])
{
  assert (argc - 1 == 1);
  long n;
  {
    char *tail;
    n = strtol (argv[1], &tail, 0);
    assert (tail > argv[1]);
    assert (*tail == '\0');
  }

  assert (n >= 1);
  assert (n <= sqrt (LONG_MAX));
  const int width = (int)ceil (2 * log (1 + n) / log (10));

  long i;