Sum of digits

You are given $N$ single-digit numbers written in a row with no spaces between them. Write a program that prints their sum.

The first line contains the count of digits $N$ ($1 \le N \le 100$).

The second line contains the $N$ digits with no spaces. Each digit is between 0 and 9, and the first digit can be 0.

Print the sum of the $N$ given digits on the first line.