Background

Special for beginners, ^_^

Description

蜗牛爬山，每小时爬n米，滑下去x米，山高s米，问蜗牛多久爬上山？

Format

Input

Three integers x and n and s, satisfying $0\leq x \leq n \leq s\leq 32767$ .

Output

One integer, the sum of x and y.

Samples

5 3 10

5

Limitation

1s, 1024KiB for each test case.