#include "bits/stdc++.h"
 
using namespace std;
typedef long long int ll;
typedef pair<ll, ll > pi;  
typedef pair<pair<ll, ll >, ll > pii;  
vector<ll > vec;
vector<vector<ll > > vec2;
ll MOD = 1000000007;
ll INF = 1145141919454519;

int main(void){
    
    ll x, y, h;
    cin >> x >> y >> h;
    x *= 1000;
    y *= 1000;

    if(x <= h || y <= h){
        cout << 0 << endl;
        return 0;
    }

    ll ans = 0;
    
    while((x > 1 || y > 1) && x > h && y > h){
        if(x >= y){
            x /= 2;
            h *= 2;
            ans++;
        }else{
            y /= 2;
            h *= 2;
            ans++;
        }
    }

    cout << ans + 1 << endl;

}