#큰수의 법칙 - Python

n, m, k = map(int, input().split())
c=list(map(int, input().split()))
p=max(c)
s=c.count(p)
if(s>1):
  print(m*p)
else:
  c.remove(p)
  q=max(c)
  a=m//(k+1)
  b=m%(k+1)
  print(a*(p*k+q)+p*b)