#yuki851

n=int(raw_input())
try:
 a=[]
 for i in xrange(n):
  a.append(int(raw_input()))
 s=[a[0]+a[1],a[1]+a[2],a[2]+a[0]]
 s.sort()
 if s[1]==s[2]:
  print s[0]
 else:
  print s[1]
except:
 print '"assert"'