#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<int, int>;
using PL = pair<ll, ll>;
// Welcome to my source code!

int main() {
    ll x, y, h;
    cin >> x >> y >> h;
    x *= 1000;
    y *= 1000;
    ll cnt = 0;
    while (x > h || y > h) {
        if (x > h) {
            x /= 2;
            h *= 2;
        } else {
            y /= 2;
            h *= 2;
        }
        cnt++;
    }
    cout << cnt << endl;
}