import sys

def main():
    import sys
    input = sys.stdin.read
    data = input().split()
    N = int(data[0])
    A = list(map(int, data[1:N+1]))
    
    if N == 1:
        print(A[0])
        return
    
    m = (N - 1) // 2  # Bob的次数
    
    A.sort()
    
    product = 1
    for num in A:
        product *= num
    
    if m == 0:
        print(product)
        return
    
    x = []
    y = []
    for i in range(m):
        idx = N - 2 - i
        if idx < 0:
            break
        x.append(A[idx])
        y.append(A[N - 1 - i])
    
    denominator = 1
    for xi, yi in zip(x, y):
        denominator *= xi * yi
    
    ans = product // denominator
    print(ans)

if __name__ == "__main__":
    main()