import sys
input = sys.stdin.readline

def main():
    N = int(input())
    tmp = list(map(int, input().split()))
    if len(tmp) > 1:
        print("assert")
    else:
        a = [tmp[0]]
        for i in range(N-1):
            a.append(int(input()))
        print(max(a) + min(a))

if __name__ == "__main__":
    main()