#include <iostream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cassert>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <algorithm>
#define llint long long
#define inf 1e18
#define rep(x, s, t) for(llint (x) = (s); (x) < (t); (x)++)
#define Rep(x, s, t) for(llint (x) = (s); (x) <= (t); (x)++)
#define eps 1e-9

using namespace std;

double x, y, h;

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> x >> y >> h;
	x *= 1000, y *= 1000;
	
	llint ans = 0;
	while(1){
		if(x > h+eps) x/=2, h*=2, ans++;
		else if(y > h+eps) y/=2, h*=2, ans++;
		else break;
	}
	cout<< ans << endl;
	
	return 0;
}