#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <stack>
#include <climits>
#include <map>
#include <set>

using namespace std;

typedef long long ll;
typedef pair<int, int> P;

const ll mod = 1000000007;
const int inf = 1e9;
const long long INF = 1LL << 60;


int main()
{
    double x,y,h;
    cin >> x >> y >> h;
    if(x>y){
        double tmp = x;
        x = y;
        y = tmp;
    }
    int ans = 0;
    x *= 1000;
    y *= 1000;
    while(x > h){
        ans++;
        x /= 2.0;
        h *= 2;
    }
     while(y > h){
        ans++;
        y /= 2.0;
        h *= 2;
    }
    cout << ans<< endl;
}