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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {

  ll x, y, h;
  cin >> x >> y >> h;
  x *= 1000;
  y *= 1000;
  
  auto calc = [&](ll x) {
    ll res = 0;
    ll now = h;
    while (x > now) {
      res++;
      now *= 4;
      h *= 2;
    }
    return res;
  };

  ll ans = 0;
  ans += calc(min(x,y));
  ans += calc(max(x,y));
  cout << ans << endl;


}