#include <bits/stdc++.h>
using ll = long long int;
using namespace std;
ll mod=1e9+7;
       
int dfs(int x,int y,int l,int ans){
  if(x>l)return dfs(x/2,y,l*2,ans+1);
  if(y>l)return dfs(x,y/2,l*2,ans+1);
  return ans;
}

int main(){
  ll x,y,l;
  cin >> x >> y >> l;
  x*=1000;
  y*=1000;
  if(x>y)swap(x,y);
  cout << dfs(x,y,l,0) << endl;
}