Problem: 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

Solution (in PYTHON):

Solution:
from sys import stdin
a,b,n = map(int,stdin.readline().split())
if a >=n:
	print 1
else:
	x = (n-a)/(a-b)
	ans = x
	if ans < 0:
		ans = 0
	s = ans * (a-b)
	#print "start with",s,ans
	while True:
		s += a
		ans+=1
		if s >=n:
			break
		s-=b
		#ans+=1
	print ans