Climbing Snail

A snail on the ground wants to climb a wooden pole that is V meters tall.

During the day, the snail climbs A meters. While sleeping at night, it slides down B meters. However, once it reaches the top of the pole, it does not slide back down.

Determine how many days the snail needs to reach the top of the pole.

The first line contains three integers A, B, and V, separated by spaces.

1 <= B < A <= V <= 1,000,000,000

Print the number of days needed for the snail to reach the top of the wooden pole.