Problem:
Score : 200 points

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.

Sample Input 1

13 3 1

Sample Output 1

3

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

Figure

Sample Input 2

12 3 1

Sample Output 2

2

Sample Input 3

100000 1 1

Sample Output 3

49999

Sample Input 4

64146 123 456

Sample Output 4

110

Sample Input 5

64145 123 456

Sample Output 5

109

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include "./bits/stdc++.h"

#include <vector>
#include <iostream>

#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define linf 9223372036854770000

using namespace std;

typedef long long ll;

/*
vector.push_back()
vector<int> hoge(3,-1); {-1,-1,-1}
vector<vector<int>> hogehoge(2,vector<int>(2,-1)); {{-1,-1},{-1,-1}} 
cin >>temp;
scanf("%d %d %d",&A,&B,&Q);
sort(a.begin(),a.end());
a.push_back(4000000000000);
a.insert(a.begin(),-1000000000000);
upper_bound(a.begin(),a.end(),x); // list[i] > x のイテレータ取得. *itrで数値化 
    std::priority_queue<
      int,
      std::vector<int>,
      decltype(compare) // 比較関数オブジェクトを指定
    > que(comp);
*/
template <typename T> void debug(T arr);
template <typename T> void debug (T arr, int dim);



int main(void){
    ll x,y,z;
    cin >> x >> y >> z;
    x = x-z;
    cout << x/(y+z) << endl;
};


template <typename T> void debug(T arr){
    for (auto col:arr){
        cout << col << " ";
    }
    cout <<endl;
};

template <typename T> void debug (T arr, int dim){
    for (auto raw:arr){
        for(auto col:raw){
            cout << col << " ";
        }
        cout << endl;
    }
};