#include<bits/stdc++.h>
using namespace std;
int main()
{
	int m,n,h,k=0,s=0;
	cin>>m>>n>>h;
	while(1){
		s++;
		k=k+m;
		if(k>=h) break;
		k-=n;
		}
		cout<<s;
	return 0;
}
/**************************************************************
	Problem: 1074
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/