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

ls =[]
for x in range(n-1):
    for y in range(1,n-1):
        for z in range(2,n-1):
            ls.append([a[x],a[y],a[z]])

ks = []
for l in ls:
    if l[0] < l[1] > l[2] or l[0] > l[1] < l[2]:
        ks.append(l)

ans = []
for k in ks:
    ans.append(sum(k))
    
print(min(ks))