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.

-----Sample Input-----
13 3 1

-----Sample Output-----
3

There is just enough room for three, as shown below:
Figure

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见题面