lines = int(input().strip())
matrix = []
flg = True
for i in range(lines):
    matrix.append(list(map(int, input().strip().split())))

for i in range(0, lines):
    for j in range(0, lines):
        if i == j:
            if matrix[i][j] != 0:
                flg = False
        else:
            if matrix[i][j] != matrix[j][i]:
                flg = False
print("YES" if flg else "NO")