from sys import stdin

def main():
    N = int(input())
    try:
        A = [int(input()) for _ in [0] * N]
    except:
        print('"assert"')
        return

    ans = sorted({A[0] + A[1], A[0] + A[2], A[1] + A[2]}, reverse=1)
    print(ans[1])

input = lambda: stdin.readline()
main()