#include<bits/stdc++.h>
using namespace std;
int m,n,h,s,d;
int main(){
    cin>>m>>n>>h;
    while(s<h){
    	d++;
		s+=m;
		if(s>=h){
			break;
		}
		s-=n;
	}
	cout<<d;
	return 0;       
}
/**************************************************************
	Problem: 1074
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/