n=int(input())
a=list(map(int,input().split()))
b=[]
for i in range(n):
    b.append([a[i],i+1])
for i in range(1,n):
    for j in range(n-i):
        if b[j+1][0]<b[j][0]:
            b[j],b[j+1]=b[j+1],b[j]
sumtime=0
for i in range(n):
    sumtime+=b[i][0]*(n-i-1)
avetime=sumtime/n
for i in range(n-1):
    print(b[i][1],end=" ")
print(b[n-1][1])
print("%.2f" % avetime)