N=int(input())
A=list(map(int,input().split()))
add=0
for i in A:
    add+=i
add-=A[-1]
ans=add+(A[-1]%A[0])
for i in range(1,N-1):
    ans=max(ans,add-A[i]+(A[-1]%A[i])+(A[i]%A[0]))
print(ans)