/*
 * bigf: Calculates "big" factorials.
 * Copyright (C) 1997 Amit Singh. All Rights Reserved.
 */

int t[131068], f = 0, l = 0;

void
F(int *t, int i)
{
    int g, z = l, c = 0;

    while (z <= f) {
        g = t[z] * i + c;
        t[z] = g % 10;
        c = g / 10;
        z = z + 1;
    }

    if (c != 0) {
        f = f + 1;
        t[f] = c;
    }
}

void
main(int a, char **r)
{
  int n, i, k;

  t[l] = 1;
  n = atoi(r[1]);

  for (i = 1; i <= n; i++)
      F(t, i);

  for (i = f; i >= l; --i)
      printf("%u", t[i]);

  printf ("\n");
}