#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define repr(i, n) for (int i = (n) - 1; i >= 0; i--)
#define range(a) a.begin(), a.end()

int f(ll x, ll y, ll z) {
  int res = 0;
  if (x > z) res = max(res, f(x, y * 2, z * 4) + 1);
  if (y > z) res = max(res, f(x * 2, y, z * 4) + 1);
  return res;
}

int main() {
  ll x, y, z; cin >> x >> y >> z;
  cout << f(x * 1000, y * 1000, z) << endl;
}