from sys import stdin
def main():
    #入力
    readline=stdin.readline
    x,y,h=map(lambda x:int(x)*(2**40),readline().split())
    x*=1000
    y*=1000

    count=0
    while True:
        if x<=y:
            if h<x: x//=2
            elif h<y: y//=2
            else: break
        else:
            if h<y: y//=2
            elif h<x: x//=2
            else: break
        count+=1
        h*=2

    print(count)

if __name__=="__main__":
    main()