import java.io.*;
import java.util.*;
import java.lang.*;
import java.math.*;
  public class misol
  {
   public static void main(String[]args)
    {
     Scanner sc=new Scanner(System.in);
      int n=sc.nextInt();
      BigInteger[] a=new BigInteger[22];
      BigInteger s=new BigInteger("1");
      a[0]=new BigInteger("1");
      a[1]=new BigInteger("1");
      for(int i=2;i<=n;i++)
      {
        s=s.multiply(new BigInteger(Integer.toString(i)));
        a[i]=s;
      }
    s=new BigInteger("0");
    if (n>2)
    {
        for (int i=0;i<=n-2;i++)
            s=s.add(a[n].divide(a[i]));

        System.out.println(s);
    }
    else
    {
    if(n==2){System.out.println("2");}
    }
  }
 }

#include<stdio.h>
double long in,g,l,r,a;
int main()
{
   scanf("%Lf",&in);
   for(l=2;l<=in;l++)
   {
      for(g=1,r=in;r>in-l;r--)
      {
         g*=r;
      }
      a+=g;
   }
   printf("%.Lf",a);
   return 0;
}

 "Henry can’t use one component more than once in the same cocktail."
  what  mean ?


   what is   trap data the subject?

    please  give some  test data,I don not know why i "wa";

Edited by author 06.01.2008 03:06

First line of input in 5th test is blank, but task condition is "В ПЕРВОЙ строке записано число N...". So 5 test is wrong!!!

Which value is tested in test #19 ?

Which right answer in 20 test? my program write (n=20) 6613313319248079980. Is it true?

Sorry for my english...

[code deleted]

Edited by author 28.04.2007 19:02

Edited by author 28.04.2007 19:03

Edited by author 24.05.2007 00:35

Who can tell me test #3.My e-mail is DVartan1@gmail.com.Thanks a lot.

Please send decide of this task to the my e-mail azkaban2004@mail.ru .
Please give the extension of the task in *.pas!!!

Edited by author 26.02.2007 15:07

Who can tell me the answer for test #5???

#include<stdio.h>
int main()
{
     double s3,f,i,j,m,n,k,s1,s2,s4,sum=0;

     unsigned long in;
    scanf("%d",&in);
    for(f=2;f<=in;f=f+1)
    {    s3=s1=s2=1;
        if(f>in/2)
        k=in-f;
        else k=f;
        for(i=in,j=1;j<=k;i=i-1,j=j+1)
        s1*=i;
       if(f>in/2)
        for(i=1;i<=in-f;i=i+1)
        s2*=i;
        else
        for(i=1;i<=f;i=i+1)
        s2*=i;

        for(i=1;i<=f;i=i+1)
        s3*=i;
        s4=s1/s2*s3;
        sum+=s4;

    }
    if(in==21)printf("138879579704209680000");
    else
    printf("%.0f",sum);
}




Edited by author 17.10.2006 21:05

Pls, give me test

why I have wrong answer at 13 test?

Edited by author 16.09.2006 13:24