// #define _GLIBCXX_DEBUG // for STL debug (optional)
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
#include <cstring>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <utility>
#include <algorithm>
#include <map>
#include <set>
#include <complex>
#include <cmath>
#include <limits>
#include <cfloat>
#include <climits>
#include <ctime>
#include <cassert>
#include <numeric>
#include <fstream>
#include <functional>
#include <bitset>
using namespace std;
using ll = long long int;
using int64 = long long int;
 
template<typename T> void chmax(T &a, T b) {a = max(a, b);}
template<typename T> void chmin(T &a, T b) {a = min(a, b);}
template<typename T> void chadd(T &a, T b) {a = a + b;}
 
int dx[] = {0, 0, 1, -1};
int dy[] = {1, -1, 0, 0};
const int INF = 1LL << 29;
const ll LONGINF = 1LL << 60;
const ll MOD = 1000000007LL;
 
int main() {
    long double x, y, h; cin >> x >> y >> h;
    x *= 1000, y *= 1000;

    int ans = 0;
    while(true) {
        // fprintf(stderr, "x = %.12Lf, y = %.12Lf, h = %.12Lf\n", x, y, h);
        if(x <= y and x > h) {
            x /= 2.0;
            h *= 2.0;
            ans++;
        }
        else if(x > y and y > h) {
            y /= 2.0;
            h *= 2.0;
            ans++;
        }
        else if(x <= y and y > h) {
            y /= 2.0;
            h *= 2.0;
            ans++;
        }
        else if(x > y and x > h) {
            x /= 2.0;
            h *= 2.0;
            ans++;
        }
        else break;
    }
    printf("%d\n", ans);
    return 0;
}