# n = int(input())
# a=[[int(i) for i in input().split()] for j in range(n)]
#
# def det(a):
#     if len(a) == 1:
#         return a[0][0]
#     k=0
#     for i in range(len(a)):
#         b=a[:i:] + a[i+1::]
#         for j in range(len(b)):
#             b[j]=b[j][1:]
#         k += a[i][0] * (-1)**i * det(b)
#     return k
# print(det(a))