x,y,h = map(int,input().split())
flag = 0
ans = 0
X = x*1000
Y = y*1000
H = h
for i in range(10**5):
    flag = 0
    if X>H and Y>H:
        flag += 1
        if (X-H)>=(Y-H):
            X /= 2
            H *= 2
            ans += 1
        elif (X-H)<Y-H:
            Y /= 2
            H *= 2
            ans += 1
    elif X>H and Y<=H:
        X /= 2
        H *= 2
        ans += 1
        flag += 1
    elif X<=H and Y>H:
        Y /= 2
        H *= 2
        ans += 1
        flag += 1
    if flag == 0:
        print(ans+1)
        break
    else:
        continue