#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0;i < n;i++)
#define ll long long
using namespace std;
//typedef vector<unsigned int>vec;
//typedef vector<ll>vec;
//typedef vector<vec> mat;
typedef pair<int, int> P;
typedef pair<ll,ll> LP;
const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};
const int INF = 1000000000;
const ll LINF = 1000000000000000000;//1e18
const ll  MOD = 1000000007;
const double PI = acos(-1.0);
const double EPS = 1e-10;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
//template<class T> inline void add(T &a, T b){a = ((a+b) % MOD + MOD) % MOD;};

int dp[60][60];

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll x, y, h;
    cin >> x >> y >> h;
    x *= 1000, y *= 1000;
    memset(dp, -1, sizeof(dp));
    dp[0][0] = 0;
    REP(i,60) REP(j,60){
        if(~dp[i][j]){
            ll H = h << (i + j);
            ll X = x >> i;
            ll Y = y >> j;
            if(X > H) dp[i+1][j] = dp[i][j] + 1;
            if(Y > H) dp[i][j+1] = dp[i][j] + 1;
        }
    }
    int ans = 0;
    REP(i,60) REP(j,60) if(dp[i][j] != -1) chmax(ans, dp[i][j]);
    cout << ans << endl;
}