X,Y,H=map(int,input().split())
X*=1000
Y*=1000

K=0
while max(X,Y)>H:
    if H<X<=Y:
        X>>=1
    elif H<Y<=X:
        Y>>=1
    elif X<=H<Y:
        Y>>=1
    elif Y<=H<X:
        X>>=1
    H<<=1
    K+=1

print(K)