Problem Statement

We have a long seat of width $X$ centimeters. There are many people who wants to sit here. A person sitting on the seat will always occupy an interval of length $Y$ centimeters.

We would like to seat as many people as possible, but they are all very shy, and there must be a gap of length at least $Z$ centimeters between two people, and between the end of the seat and a person.

At most how many people can sit on the seat?

Constraints

• All input values are integers.
• $1 \leq X, Y, Z \leq 10^5$
• $Y+2Z \leq X$

Input

Input is given from Standard Input in the following format:

X Y Z

Output

Print the answer.