#include <bits/stdc++.h>
using namespace std;

int main() {
	long x,y,h,ans;
	cin >> x >> y >> h;
	x*=1000; y*=1000;
	ans=0;
	if(x>y) swap(x,y);
	while(x>h){
		x/=2; h*=2;
		ans++;
	}
	while(y>h){
		y/=2; h*=2;
		ans++;
	}
	cout << ans << endl;
	return 0;
}