Timus : 1068 (Sum)



// http://acm.timus.ru/problem.aspx?space=1&num=1068
// Runtime: 0.015s
// Tag: Adhoc

// @BEGIN_OF_SOURCE_CODE

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <list>
#include <vector>
#include <map>
#include <sstream>
#include <cmath>
#include <bitset>
#include <utility>
#include <set>
#include <numeric>

#define INF_MAX 2147483647
#define INF_MIN -2147483647
#define pi acos(-1.0)
#define N 1000000
#define LL long long

#define For(i, a, b) for( int i = (a); i < (b); i++ )
#define Fors(i, sz) for( size_t i = 0; i < sz.size (); i++ )
#define Fore(it, x) for(typeof (x.begin()) it = x.begin(); it != x.end (); it++)
#define Set(a, s) memset(a, s, sizeof (a))
#define Read(r) freopen(r, "r", stdin)
#define Write(w) freopen(w, "w", stdout)

using namespace std;

int main ()
{
    int n;

    while ( scanf ("%d", &n) != EOF ) {
        int sum = 0;

        if ( n <= 0 ) {
            for ( int i = n; i <= 1; i++ ) sum += i;
        }
        else {
            for ( int i = 1; i <= n; i++ ) sum += i;
        }

        printf ("%d\n", sum);
    }

    return 0;
}

// @END_OF_SOURCE_CODE
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