#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,m,n,h,s=0;
	cin>>m>>n>>h;
	for(i=1;1;i++){
		s+=m;
		if(s>=h){
			cout<<i;
			break;
		}
		s-=n;
	} 
return 0;}

/**************************************************************
	Problem: 1074
	User: fzy001
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2072 kb
****************************************************************/