#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define MAX(a,b) (a > b ? a : b)
#define MIN(a,b) (a < b ? a : b)
const int inf = 1000000000; // 10^9

int main(){
   int x,y,h;scanf("%d%d%d",&x,&y,&h);
   int ans=0;
   while(1){
      if(x<h){
         x/=2;
         h*=2;
         ans++;
      }else if(y<h){
         y/=2;
         h*=2;
         ans++;
      }else break;
   }
   printf("%d",ans);
}