#include <bits/stdc++.h>

using namespace std;


int ans;
long double r,h,w;

void rec (long double a, long double b, int step)
{
    if ((4 * r * r) - (a * a + b * b) >= 0)
    {
        //cout << 4 * r * r << " " << a * a + b * b <<  endl;
        ans = min(ans, step);
        return;
    }

    rec(a / 2, b, step + 1);
    rec(a, b / 2, step + 1);
}



int main()
{
   // freopen("input.txt", "r", stdin);
   //freopen("output.txt", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    //cout << fixed << setprecision(20);

    cin >> r >> h >> w;

    ans = 1e9;
    rec(h, w, 0);

    cout << ans;

    return 0;
}