n = int(input())
a = list(map(int,input().split()))

for i in range(1,n):
    v = a[i]
    j = i - 1
    while j >= 0 and a[j] > v:
        a[j+1] = a[j]
        j -= 1
    a[j+1] = v
print(a)
total = sum(a)

for i in range(n):
   if i !=0 and a[i] == a[i-1] +1:
       total -= a[i]

print(total)