n,m,x=map(int,input().split())
n*=1000
m*=1000
cnt=0
def  cal(n,m,x):
    t=min(n,m)
    t2=max(n,m)
    if  t > x:
        return t2 , t/2 , x*2
    elif t2 > x:
        return t2/2 , m , x*2
    else:
        return 0 , 0 , 1
    
for i in range(1000):
    if n <= x and m <= x:
        break
    cnt+=1
    n,m,x=cal(n,m,x)
print(cnt)