102 - Divisor

Divisor

Time Limit: 1 sec

**The Problem**

In a division problem, the dividend is **D, **the quotient is **Q **and the remainder is **R**. What is the divisor?

Example:

if **D** = 16, **Q** = 5 and **R** = 1 then

Divisor is 3

**The Input**

The input file contains only 3 integer numbers **D**, **Q** and **R** (**D**<=4000, **Q**<100 and **R**<20).

**The Output**

Output will show the one integer numbers in a separate line.

**Sample Input**

16 5 1

**Sample Output**

3

Problem Setter: Shahin ShamS