#include <bits/stdc++.h>
using namespace std;

int main() {
    double x, y, h;
    cin >> x >> y >> h;
    int ans = 0;
    if(x > y) swap(x, y);
    x *= 1000, y *= 1000;
    while(x > h) x /= 2, h *= 2, ans++;
    while(y > h) y /= 2, h *= 2, ans++;
    cout << ans << '\n';
    return 0;
}