题解 | AOE还是单体？
AOE还是单体？
https://www.nowcoder.com/practice/84dec7e96e3d4f75808b47e1b8b0280c
n,x = map(int,input().split())
a = list(map(int,input().split()))
cnt = 0
a.sort()
if x >= n :
print(sum(a))
else :
for i in range(n-x,n):
a[i] -= a[n-x-1]
print(a[n-x-1]*x + sum(a[n-x:n]))
