x,y,h=list(map(int,input().split()))
n=0
while True:
    if x>=y and y>(h*100):
        y=y/2
        h=h*2
        n=n+1
    elif x>(h*100):
        x=x/2
        h=h*2
        n-n+1
    else:
        break
print(n)