#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;
    ll mi = min(x, y), ma = max(x, y);
    int ans = 0;
    while(mi > h) mi /= 2, h *= 2, ans++;
    while(ma > h) ma /= 2, h *= 2, ans++;
    cout << ans << endl;
}