#include <bits/stdc++.h>
using namespace std;
int main(){
	int m,n,h,t=0;
	cin>>m>>n>>h;
	h-=m;
	t++;
	while(h>0){
		h-=(m-n);
		t++; 
	} 
	cout<<t;
}
/**************************************************************
	Problem: 1074
	User: wangyiyang
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/