x, y, h = map(int,input().split())
ans = 0
while True:
    if x*1000 > h and y*1000 > h:
        if x < y:
            x /= 2
            h += h
            ans += 1
        else:
            y /= 2
            h += h
            ans += 1
    elif x*1000 > h:
        x /= 2
        h += h
        ans += 1
    elif y*1000 > h:
        y /= 2
        h += h
        ans += 1
    else:
        break
print(ans)