#include<iostream>
using namespace std;

int main(){
	int m,n,h,i,j;
	cin>>m>>n>>h;
	i=0;
	j=0; 
	while(true){
		i=i+m;
		j++;
		
		if(i>=h){
			break;
		}
		
		i=i-n;
	}
	
	cout<<j<<endl;	
}

/**************************************************************
	Problem: 1074
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/