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

int main() {
    ll x, y, h;
    cin >> x >> y >> h;
    x *= 1000;
    y *= 1000;
    if (x > y) swap(x, y);
    
    int cnt = 0;
    bool fr = false;
    while (x > h || (x == h && fr)) {
        if (x % 2 != 0) fr = true;
        x /= 2;
        h *= 2;
        cnt ++;
    }

    fr = false;
    while (y > h || (y == h && fr)) {
        if (y % 2 != 0) fr = true;
        y /= 2;
        h *= 2;
        cnt ++;
    }

    cout << cnt << endl;
    return 0;
}