#include <bits/stdc++.h>
using namespace std;
int main(){
    int m,n,h,t=0;
    cin>>m>>n>>h;
    h-=m;
    t++;
    while(h>0){
        h-=(m-n);
        t++; 
    } 
    cout<<t;
}
/**************************************************************
	Problem: 1074
	User: yangjunwen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/