x,y,h=map(int,input().split())
x,y,h=(x*(10**20000003)),(y*(10**20000003)),(h*(10**20000000))
C=0
if x>y:
    while y>h:
        y=y//2
        h=h*2
        C=C+1
    while x>h:
        x=x//2
        h=h*2
        C=C+1
else:
    while x>h:
        x=x//2
        h=h*2
        C=C+1
    while y>h:
        y=y//2
        h=h*2
        C=C+1
print(C)