125 - Hostel Meal (II)

Hostel Meal (II)

Time Limit: 1 sec

**The Problem**

In a hostel **S1** students have food for **D1** days. After **D2** days **S2** more students joined the hostel. How many days will the ramaining food last ?

Example:

if **S1** = 500, **D1** = 50, **D2** = 10 and **S2 **= 300 then

food will last 25 days

**The Input**

The input file contains only 4 integer numbers **S1, D1, D2, S2 **(**S1, D1, D2, S2**<=1000).

**The Output**

Output will show the one integer number which is the days food will last in a separate line.

**Sample Input**

500 50 10 300

**Sample Output**

25 days

Problem Setter: Shahin ShamS