import math
n=int(input())
nr=list(map(float,input().split()))
#print(nr)
r=sum(nr)/len(nr)
#print(r)
d=0
for i in range(n):
    d+=(nr[i]-r)**2
d=math.sqrt(d/n)
#print(d)
c=0
for i in range(n):
    if nr[i]>=(r-d) and nr[i]<=(r+d):
        c+=1
#print(c)
rap=(c/n)*100
print(rap)

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