x,y,h=map(int,input().split())
X=x*1000
Y=y*1000
DP=[{} for i in range(200)]
DP[0][(X,Y,h*1.0)]=1
#print(DP)
for i in range(1,len(DP)):
    for K,v in DP[i-1].items():
        a,b,c=K
        if a>c+0.000001:
            #print(i,a,b,c)
            DP[i][(a/2,b,c*2)]=1
        if b>c+0.000001:
            #print(i,a,b,c)
            DP[i][(a,b/2,c*2)]=1
for i in range(len(DP)):
    if len(DP[i])==0:
        print(i-1)
        exit()