Office#576
Besides creating sequences, in the summer Vasya liked looking out the window. Opposite his house was the office of a construction company. Throughout an entire month, Vasya observed its employees. For each of the days of the month, he knows how many employees came to work. He also knows that each employee took exactly days off during the month.
Now Vasya is wondering: how many employees in total work in this office? Write a program to answer Vasya's question.
You are given non-negative integers. These numbers give the number of employees who came to the office on each respective day of the month. It is guaranteed that the input data is correct.
Output a single integer: the total number of employees in the office. It is guaranteed that this number does not exceed .
Example 1