#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  ll x, y, h;
  cin >> x >> y >> h;
  x *= 1000, y *= 1000;
  ll ans = 0;
  while (true) {
    if (x > y) swap(x, y);
    if (x > h)
      x = (x + 1) / 2, h *= 2, ans++;
    else if (y > h)
      y = (y + 1) / 2, h *= 2, ans++;
    else
      break;
  }
  cout << ans << '\n';
  return 0;
}