#include <iostream>
#include <string>
#include <vector>
#include <numeric>

using namespace std;
using ull = unsigned long long;

void ori(ull& w, ull& h)
{
	w /= 2;
	h *= 2;
}

int main() 
{
	ull x, y, h;
	cin >> x;
	cin >> y;
	x *= 1000;
	y *= 1000;
	cin >> h;

	int ope = 0;
	while (true)
	{
		if (x < y)
		{
			if (x > h)
				ori(x, h);
			else if (y > h)
				ori(y, h);
			else
				break;
		}
		else
		{
			if (y > h)
				ori(y, h);
			else if (x > h)
				ori(x, h);
			else
				break;
		}
		++ope;
	}
	cout << ope << endl;

	return 0;
}