#include <iostream>

using namespace std;

int main(){
	int graf[100][100], n, b = 1;
	cin >> n;
	for (int i = 0; i < n; i++){
		for (int j = 0; j < n; j++){
			cin >> graf[j][i];
		}
	}
	for (int i = 0; i < n; i++){
		for (int j = 0; j < n; j++){
			if (graf[i][j]){
				if (i == j || graf[i][j] != graf[j][i])b = 0;
			}
		}
	}
	if (b)cout << "YES";
	else cout << "NO";
	//while (1);
	return 0;
}