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

using namespace std;
using ull = unsigned long long;
int main() 
{
	ull x, y;
	ull h;
	cin >> x;
	cin >> y;
	x *= 1000;
	y *= 1000;
	cin >> h;

	int ope = 0;
	while (true)
	{
		if (x > h)
		{
			x /= 2;
			h *= 2;
		}
		else if (y > h)
		{
			y /= 2;
			h *= 2;
		}
		else
			break;
		++ope;
	}
	cout << ope << endl;

	return 0;
}