n=int(input())
s=0
l=[[]for i in range(n)]
for i in range(n):
    l[i]=list(map(int,input().split()))
for i in range(n):
    for j in range(n):
            if l[i][j]==l[j][i]:
                s+=1
if s!=n*n:
    print("no")
else:
    print("yes")