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
import math
x,y,z=map(eval, raw_input().split())
a,b,n=int(x),int(y),int(z)
ans=math.ceil((float(n-b)/float(a-b)))
print(int(ans))