using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.Intrinsics.X86;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static string[] SList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => ReadLine()).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var c = NList;
        var (a, b, h) = (c[0], c[1], c[2]);
        var x = a * 1000.0;
        var y = b * 1000.0;
        var d = (double)h;
        var ans = 0;
        for (var i = 0; i < 21; ++i)
        {
            var mx = x / (1 << i);
            var md = d * (1 << i);
            ans = Math.Max(ans, i);
            // WriteLine($"1 x = {x}, y = {y}, d = {md}");
            for (var j = 0; j < 21; ++j)
            {
                var my = y / (1 << j);
                var mmd = md * (1 << j);
                ans = Math.Max(ans, i + j);
                // WriteLine($"2 x = {mx}, y = {my}, d = {mmd}");
                for (var k = 0; k < 21; ++k)
                {
                    var mmx = mx / (1 << k);
                    var mmmd = mmd * (1 << k);
                    ans = Math.Max(ans, i + j + k);
                    // WriteLine($"3 x = {mmx}, y = {my}, d = {mmmd}");
                    if (mmx <= mmmd) break;
                }
                if (my <= mmd) break;
            }
            if (mx <= md) break;
        }
        WriteLine(ans);
    }
}