#include "bits/stdc++.h"
using namespace std;
typedef long long ll;

int main() {
    ll x, y, h; cin >> x >> y >> h;
    x *= 1000;
    y *= 1000;
    int cnt = 0;
    while (h < x || h < y) {
        cnt++;
        if (h < y && x >= y) {
            x *= 2;
            h *= 4;
        }
        else {
            y *= 2;
            h *= 4;
        }
        //cout << x << " " << y << " " << h << endl;
    }
    cout << cnt << endl;
    return 0;
}