#include <stdio.h>
#include <string>
#include <cstring>
#include <stdlib.h>
#include <math.h>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <iterator>
#include <assert.h>
#pragma warning(disable:4996) 
 
typedef long long ll;
#define MIN(a, b) ((a)>(b)? (b): (a))
#define MAX(a, b) ((a)<(b)? (b): (a))
#define LINF  9223300000000000000
#define LINF2 1223300000000000000
#define INF 2140000000
//const long long MOD = 1000000007;
const long long MOD = 998244353;

using namespace std;


void solve()
{
    ll x, y,h;
    scanf("%lld%lld%lld", &x, &y, &h);
    ll xx = x*1000;
    ll yy = y*1000;
    ll hh = h;
    int cnt = 0;
    if (xx > yy) swap(xx, yy);
    while(1) {
        if (xx <= hh) break;
        xx /= 2;
        hh *= 2;
        cnt++;
    }
    while(1 ) {
        if (yy <= hh) break;
        yy /= 2;
        hh *= 2;
        cnt++;
    }
    printf("%d\n", cnt);

    return;
}

int main(int argc, char* argv[])
{
#if 1
    solve();
#else
    int T; scanf("%d", &T);
    while(T--) {
        solve();
    }
#endif
    return 0;
}