def check(n):
    for i in range(2, 9):
        if n % (10 * i) == 0:
            return True
    return False


a, b = map(int, input().split())

if check(a) and check(b):
    print(int(a * b / 10))
else:
    result = a * b
    if result < 100000000 and result > -100000000:
        print(result)
    else:
        print('E')