#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 1000000000


int main(){
    
	long long x,y,h;
	cin>>x>>y>>h;
	
	x*=1000;
	y*=1000;
	
	if(x>y)swap(x,y);
	
	int ans = 0;
	
	while(true){
		if(x>h){
			y*=2;
			h*=4;
			ans++;
		}
		else if(y>h){
			x*=2;
			h*=4;
			ans++;
		}
		else{
			break;
		}
	}
	
	cout<<ans<<endl;
	
    return 0;
}