Zaebal

include <iostream>
using namespace std;

int calculate(int a, int b, int h) {
	int currentH =0;
	int days=0;
	while(currentH < h){
		currentH+=a;
		if (currentH < h)
			currentH -=b;
		days++;
	}
	return days;
}

int main(){
	int a, b, h;
	cin >>  a;
	cin >> b;
	cin >> h;
	cout << calculate(a, b, h);

    return 0;

}