n = int(input())
t = input().split(' ');
if len(t) == 3:
	print("\"assert\"")
else:
	p = list(map(int, t));
	x = int(p[0])
	y = int(input())
	z = int(input())
	a = [ x, y, z ]
	a.sort();
	if a[0] == a[1]:
		print(a[0] + a[1]);
	else:
		print(a[0] + a[2]);