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)