Charting a Running Total

A launch dashboard at Kestrel Media charts sign-ups, but not the daily count: it charts the total accumulated so far, so day three's point is everything that arrived on days one, two and three together. A chart like that only ever climbs, which is the point — it answers "how far are we towards the target" rather than "how did today go". The dashboard's headline is the last point on that climbing line: the total at the end of the run.

Task: Print the total number of sign-ups at the end of the run.

Input

The first line holds an integer n, the number of days. Each of the next n lines holds that day's sign-up count, in day order.

Output

One line holding the accumulated total on the final day, as a plain integer.

Example:

Input:
3
10
20
15

Output:
45