#include <iostream>
#include <iomanip>
#include <cstring>
#include <vector>
#include <algorithm>
#include <math.h>
#include <iomanip>
#include <ctime>

using namespace std;

int main()
{
	int r, h, w;
	int ans = 0;
	cin >> r >> h >> w;
	while (2*r < sqrt(h*h + w*w))
	{
		ans++;
		if (h > w)
		{
			h = h/2;
		}
		else
		{
			w = w/2;
		}
	}
	cout << ans << endl;

	return 0;
}