#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    ll x,y,h; cin >> x >> y >> h; x *= 1000, y *= 1000;
    function<ll(ll,ll)> dfs = [&](ll x, ll y) -> ll {
        if(x > y) swap(x, y);
        if(x > h) {
            x = (x + 1) / 2, h *= 2;
            return 1 + dfs(x, y);
        } else if(y > h) {
            y = (y + 1) / 2, h *= 2;
            return 1 + dfs(x, y);
        } else {
            return 0;
        }
    };

    cout << dfs(x, y) << endl;
}