#include <bits/stdc++.h>
#include <string>
#define ft first
#define sc second
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) (a)=max(a, b)
#define chmin(a, b) (a)=min(a, b)
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
static const ll INF=1e18;
static const ll MAX=101010;
static const ll MOD=1e9+7;


/*
 for(i=0; i<N; i++)
   cin >> a[i];
*/




int main(void) {
  ll i, j, k;
  
  ll x, y, h;
  cin >> x >> y >> h;
  x*=1000; y*=1000;
  
  ll cnt=0;
  while(x>h || y>h) {
    
    if(x<y) {
      if(x>h) {x>>=1; h<<=1;}
      else    {y>>=1; h<<=1;}
    }else {
      if(y>h) {y>>=1; h<<=1;}
      else    {x>>=1; h<<=1;}
    }
    
    cnt++;
    
  }
  
  
  pt(cnt);
}