def IsOriented(Array, rng):
    Flag = True
    for i in range (rng):
        for j in range (rng):
            if i == j:
                if Array[i][j] != 0:
                    Flag = False
            if Array[i][j] != Array[j][i]:
                Flag = False
    return Flag

def FillMatrix(n):
    Array = []
    for i in range (n):
        Array.append(list(map(int, input().split())))
    return Array

n = int(input())
Matrix = FillMatrix(n)

if IsOriented(Matrix, n) == True:
    print('YES')
else:
    print('NO')