import sys
sys.setrecursionlimit(10000000)
MOD = 10 ** 9 + 7
INF = 10 ** 15

def main():
    N = int(input())
    A = list(map(int,input().split()))

    ma,mi = A[0],A[0]
    div = lambda x,y: abs(x)//abs(y) if x*y > 0 else -(abs(x)//abs(y))
    for i in range(1,N):
        if A[i] == 0:
            X = ma + A[i],ma - A[i],ma * A[i],mi + A[i],mi - A[i],mi * A[i]
        else:
            X = ma + A[i],ma - A[i],ma * A[i],div(ma,A[i]),mi + A[i],mi - A[i],mi * A[i],div(mi,A[i])
        ma = max(X)
        mi = min(X)
    print(ma)
if __name__ == '__main__':
    main()