In paskal when n=10000 you can not write this expression n*(n+1)*(n+2)/2 in some variables it is very long and big number so in C++ it is very easy just write(here is my AC program):
#include <cstdlib>
#include <iostream>

using namespace std;

int main(int argc, char *argv[])
{
    long long n;
    cin>>n;
    cout<<n*(n+1)*(n+2)/2<<endl;
    system("PAUSE");
    return EXIT_SUCCESS;
}

Edited by author 27.04.2008 17:47