Description

The CSP (Computer Science Programming) competition usually consists of four problems. According to the competition rules, the total score is the sum of the scores from all four problems. Given a contestant's scores for each of the four problems, calculate their total score.

Input Format

One line containing four non-negative integers not exceeding 100, representing the contestant's score for each problem.

Output Format

A single number representing the total score for the competition.

Sample

100 75 25 0

200