#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long LL;
typedef pair<LL,LL> P;
const LL mod=1000000007;
const LL LINF=1LL<<60;
const int INF=1<<30;
int dx[]={1,0,-1,0};
int dy[]={0,1,0,-1};


int main(){
    LL x,y,h;cin >> x >> y >> h;
    x *= 1000;
    y *= 1000;
    if(x > y) swap(x,y);
    LL ans = 0;
    while(h < x){
        ans++;
        h *= 2;
        x /= 2;
    }
    while(h < y){
        ans++;
        h *= 2;
        y /= 2;
    }
    cout << ans << endl;
    return 0;
}