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