p04029 AtCoder Beginner Contest 043 - Children and Candies (ABC Edit)
There are N children in AtCoder Kindergarten. Mr. Evi will arrange the children in a line, then give 1 candy to the first child in the line, 2 candies to the second child, ..., N candies to the N-th child. How many candies will be necessary in total?

Constraints

* 1≦N≦100

Input

The input is given from Standard Input in the following format:


N


Output

Print the necessary number of candies in total.

Examples

Input

3


Output

6


Input

10


Output

55


Input

1


Output

1
```python
N=int(input())
print(int(((1+N)*int(N))/2))
```