#include <bits/stdc++.h>

#define rep(X,N) for(ll X = 0; X < (N); X++)
#define PI (acos(-1.0))
#define pback push_back
#define mpair make_pair
#define MODN 1000000007
#define ALL(V) (V).begin(),(V).end()
#define INT_MAX_HALF (INT_MAX / 2)
#define EPS (1e-10)

using namespace std;
typedef long long ll;

int ans = 0;

void dfs(double x, double y, double h, int c){

    ans = max(ans, c);

    if(x > h){
        dfs(x / 2, y, h * 2, c + 1);
    }

    if(y > h){
        dfs(x, y / 2, h * 2, c + 1);
    }
}

int main(){

    double x, y, h;
    cin >> x >> y >> h;

    h = h * 0.001;

    dfs(x, y, h, 0);

    cout << ans << endl;
}