zp1629.cpp

一个acm题目系统会自动删除debug和release目录

//---------------------------------------------------------------------------

#pragma hdrstop

//---------------------------------------------------------------------------

#pragma argsused
#include <iostream.h>
int main(int argc, char* argv[])
{
  int i,s,n,a[510];

  a[1]=1;
  for (i=2;i<=500;i++)
    a[i]=a[i-1]+i;

  while (cin>>n)
  {
    s=0;
    for (i=1;i<=n;i++)
      s+=a[i];
    for (i=n-1;i>0;i-=2)
      s+=a[i];
    cout<<s<<endl;
  }
  return 0;
}
//---------------------------------------------------------------------------