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

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

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