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