package main

import (
  "fmt"
)

func main() {
  var x,y,h,i,buf int
  fmt.Scan(&x)
  fmt.Scan(&y)
  fmt.Scan(&h)
  buf,i = task(1000*x,h,i)
  _,i = task(1000*y,buf,i)
  fmt.Println(i)
}

func task(a,h,i int) (int,int) {
  for {
    if a > h {
      a /= 2
      h *= 2
      i++
    }
    if a < h {
      return h,i
    }
  }
}