# 貪欲にx,yの小さい方からやればいいのか
X, Y, H = map(int, input().split())
smaller = min(X, Y)*1000
larger = max(X, Y)*1000
count = 0
while smaller > H:
    smaller /= 2
    H *= 2
    count += 1
while larger > H:
    larger /= 2
    H *= 2
    count += 1    
print(count)