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

/**************************************************************
	Problem: 1074
	User: zhouhongyi
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/