Average value

a,b=map(int,input().split())

l=list(map(int,input().split()))

c=[]

for i in range(len(l)):

    if l[i]>=b:

        c.append(l[i])

s=0

co=0

for i in range(len(c)):

    s+=c[i]

    co=co+1

print(format(s/co,'.2f'))