#include <bits/stdc++.h>
#define ALL(v) std::begin(v), std::end(v)
#define ALLR(v) std::rbegin(v), std::rend(v)
using ll = std::int64_t;
using ull = std::uint64_t;
using pii = std::pair<int, int>;
using tii = std::tuple<int, int, int>;
using pll = std::pair<ll, ll>;
using tll = std::tuple<ll, ll, ll>;
template <typename T> using vec = std::vector<T>;
template <typename T> using vvec = vec<vec<T>>;
template <typename T> const T& var_min(const T &t) { return t; }
template <typename T> const T& var_max(const T &t) { return t; }
template <typename T, typename... Tail> const T& var_min(const T &t, const Tail&... tail) { return std::min(t, var_min(tail...)); }
template <typename T, typename... Tail> const T& var_max(const T &t, const Tail&... tail) { return std::max(t, var_max(tail...)); }
template <typename T, typename... Tail> void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); }
template <typename T, typename... Tail> void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); }
template <typename T> const T& clamp(const T &t, const T &low, const T &high) { return std::max(low, std::min(high, t)); }
template <typename T> void chclamp(T &t, const T &low, const T &high) { return t = clamp(t, low, high); }
template <typename T> T make_v(T init) { return init; }
template <typename T, typename... Tail> auto make_v(T init, std::size_t s, Tail... tail) { auto v = std::move(make_v(init, tail...)); return vec<decltype(v)>(s, v); }
template <typename T, std::size_t Head, std::size_t ...Tail> struct multi_dem_array { using type = std::array<typename multi_dem_array<T, Tail...>::type, Head>; };
template <typename T, std::size_t Head> struct multi_dem_array<T, Head> { using type = std::array<T, Head>; };
template <typename T, std::size_t ...Args> using mdarray = typename multi_dem_array<T, Args...>::type;
namespace init__ { struct InitIO { InitIO() { std::cin.tie(nullptr); std::ios_base::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(30); } } init_io; }

const std::size_t SIZE = 64;
bool dp[SIZE][SIZE];

ll solve() {
    dp[0][0] = true;
    ll x, y, h;
    std::cin >> x >> y >> h;
    x *= 1000;
    y *= 1000;
    for (ll i = 0; i < 2 * SIZE; i++) {
        ll ch = h;
        bool ok = true;
        for (ll j = 0; j < i; j++) {
            ch *= 2;
            if (x <= ch && y <= ch) {
                ok = false;
                break;
            }
        }
        if (!ok) break;
        for (ll j = 0; j <= std::min<ll>(i, SIZE - 1); j++) {
            ll k = i - j;
            if (!dp[j][k]) continue;
            ll cntx = (1ll << j), cnty = (1ll << k);
            if (cntx <= std::numeric_limits<ll>::max() / ch && ch * cntx < x) dp[j + 1][k] = true;
            if (cnty <= std::numeric_limits<ll>::max() / ch && ch * cnty < y) dp[j][k + 1] = true;
        }
    }

    ll ans = 0;
    for (ll i = 0; i < SIZE; i++) for (ll j = 0; j < SIZE; j++) if (dp[i][j]) {
        chmax(ans, i + j);
    }
    return ans;
}

int main() {
    std::cout << solve() << '\n';
    return 0;
}