#include <bits/stdc++.h>
using namespace std;

using ll = long long;

int dfs(ll x, ll y, ll h)
{
    if ((x & 1) || (y & 1)) {
        x <<= 1;
        y <<= 1;
        h <<= 1;
    }

    int a1 = 0, a2 = 0;
    if (x > h) {
        a1 = 1 + dfs(x/2, y, h*2);
    }
    if (y > h) {
        a2 = 1 + dfs(x, y/2, h*2);
    }
    return max(a1, a2);
}

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

    int ans = dfs(x, y, h);

    cout << ans << endl;
}