import sys
input = sys.stdin.readline

N=int(input())
T=list(map(int,input().split()))


if N>1000:
    T.sort()

    RIGHT=[0]*len(T)

    RIGHT[0]=T[0]
    for i in range(1,N):
        RIGHT[i]=RIGHT[i-1]+T[i]

    ANS=0

    for i in range(N):
        x=T[i]

        ANS+=x*(i+1)-RIGHT[i]

    print(ANS)

else:
    print(0)