#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
using namespace std;
typedef long long int ll;
typedef pair<int,int> P;
#define yn {puts("YES");}else{puts("NO");}
#define MAX_N 200005

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

    int ans = 0;

    rep(i,100){
        // cout << i << endl;
        ll now = (1 << i);
        now *= h;
        int tmp = i;
        while(y > now){
            tmp++;
            now *= 4;
        }
        ans = max(ans, tmp);
        if((1 << (i * 2)) * h >= x)break;
    }

    cout << ans << endl;
    return 0;
}