Lazy caterer sequence is defined as the maximum number of pieces formed when slicing a convex pancake with n cuts (each cut is a straight line). The formula is Cn = n·(n + 1) / 2 + 1. You are given n; calculate n-th element of the sequence.

Input

The only line of the input contains an integer n (0 ≤ n ≤ 100).

Output

Output the n-th element of lazy caterer sequence.

Examples

Input

2


Output

4


Input

5


Output

16

Source: codeforces | Difficulty: EASY


Solutions: