#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: fuyijun
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/