#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

const int INF = 1e9;
const int MOD = 1e9+7;
const ll LINF = 1e18;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) for(int i=0;i<(n);++i)
#define REPR(i,n) for(int i=n;i>=0;i--)
#define ALL(v) (v.begin(),v.end())
#define COUT(x) cout<<(x)<<'\n'


int main(){
    ll x,y,h;
    cin >> x >> y >> h;
    x *= 1000;y*=1000;
    int count = 0;
    while(x>h||y>h){
        if(x>h) x /= 2.0;
        else if(y>h) y /= 2.0;
        h *= 2;
        count++;
    }
    COUT(count);
    return 0;
}