Alice is climbing stairs. There are total N stairs. She climbs A stairs upwards in day and she comes downstairs in night by B stairs. Find number of days she will take to reach the top of staircase.

Input:
First and only line contains three space separated integers denoting A, B, N.

Output:
Print only one line of output denoting the answer to the question.

Constraints:
1 ≤ B<A≤N ≤ 10^9

SAMPLE INPUT
5 1 6

SAMPLE OUTPUT
2

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