mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline
    
    N = int(input())
    A = list(map(int, input().split()))
    
    if N & 1:
        if N == 1:
            print(A[0])
        else:
            print(1)
    else:
        if N == 2:
            print(A[0] * A[1])
        else:
            A.sort()
            print(min(A[2], A[0] * A[1]))


if __name__ == '__main__':
    main()