import sequtils, strutils, algorithm, math, future, sets, tables, hashes, intsets
let read = iterator : string {.closure.} = (while true: (for s in stdin.readLine.split : yield s))


var
    x,y,h = read().parsefloat
    maxv = int.low

h = h / 1000

proc dfs(x,y,h: float, cnt: int) = 
    if h >= x and h >= y:
        maxv = max(maxv, cnt)
    else:
        if x > h:
            dfs(x / 2, y, h * 2, cnt + 1)
        if y > h:dfs(x, y / 2, h * 2, cnt + 1)

dfs(x,y,h,0)

echo maxv