#include <iostream>
#include <vector>

using namespace std;

int main() {
    size_t n;
    cin >> n;
    vector <vector <int> > vector(n, vector <int> (n));
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            cin >> vector[i][j];
            if (vector[i][j] == 0)
                vector[i][j] = 1000;
            else
                vector[i][j] = -1;
        }
    }
    if (n < 0) {
        cout << "Отрицательный параметр";
    } else {
        vector <int> distance(n);
        for (int j = 0; j < n; ++j) {
            for (int i = 0; i < n; ++i) {
                for (int j = 0; j < n; ++j) {
                    if (vector[i][j] < 1000 && vector[j][j] < 1000)
                        vector[i][j] = min(vector[i][j], vector[i][j] + vector[j][j]);
                }
            }
        }
        for (int i = 0; i < n; ++i) {
            if (vector[i][i] < 0) {
                cout << 1 << endl;
                return 0;
            }
        }
        cout << 0 << endl;
        return 0;
    }
}