#include <iostream>
#include <vector>
#include <queue>
#include <fstream>

int main()
{


    std::ifstream in("input.txt");
    std::cin.rdbuf(in.rdbuf());

    std::ofstream out("output.txt");
    std::cout.rdbuf(out.rdbuf());

    int n;
    std::cin >> n;
    std::vector<std::vector<int>> graph(n, std::vector<int>(n));


    int flag;

    for(int i = 0; i < n; ++i)
    {
        for(int j = 0; j < n; ++j)
        {
            std::cin >> flag;
            graph[i][j] = (flag);
        }
    }

    int count_n = n;

    std::queue<int> bfs;
    bfs.push(0);

    std::vector<char> visit(n, 0);

    while( !bfs.empty() )
    {
        int eax = bfs.front();
        bfs.pop();
        for(int i = 0; i < n; ++i)
        {
            if(graph[eax][i] && !visit[i])
            {
                --count_n;
                bfs.push(i);
                visit[i] = true;
            }
        }

    }


    if ( count_n == 0)
    {
        std::cout << "Yes";
    }
    else
        {
        std::cout << "No";
        }

    return 0;
}