n,m,x=map(int,input().split())
n*=1000
m*=1000
cnt=0
def  cal(n,m,x):
    if n >= m and m > x: return n , m/2 , x*2
    else:
        if n > x: return n/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)