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#include <bits/stdc++.h>

#define MAXR 1000
#define MAXC 1000

using namespace std;

void NhapMaTran(int a[][MAXC], int &n) {
	cin >> n;

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) cin >> a[i][j];
	}

}

bool isMaTranDonVi(int a[][MAXC], int n) {
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if ((i == j && a[i][j] != 1) || ((i != j) && a[i][j] != 0)) {
				return false;
				break;
			}
		}
	}

	return true;
}


int main() {
    int a[MAXR][MAXC], n;
    NhapMaTran(a, n);
    std::cout <<  std::boolalpha << isMaTranDonVi(a, n);
    return 0;
}