Pyramid Block Count

In this problem, you are required to calculate the total number of blocks needed to build a pyramid with L levels. The pyramid is built such that the first level consists of 1 block, the second level consists of 2 blocks, and so on. The total number of blocks for a pyramid with L levels can be computed using the formula:

\(\frac{L(L+1)}{2}\)

Constraints: 1 \(\leq\) L \(\leq\) 1,000,000

You need to read the input from standard input and output the result to standard output.

inputFormat

The input consists of a single integer L representing the number of levels in the pyramid.

Example:

3

outputFormat

Output a single integer which is the total number of blocks required to build the pyramid.

Example:

6

## sample

1

1

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