#include <vector>
#include <iostream>
#include <climits>
using namespace std;

const int inf = INT_MAX;

int main()
{
	int n, s, t;
	cin >> n >> s >> t;
	vector<vector<int> > d(n + 1, vector<int>(n + 1,inf));
	for (int i = 0; i < n; ++i)
	{
		for (int j = 0; j < n; ++j)
		{
			int a;
			cin >> a;
			if (a != -1)
			{
				d[i + 1][j + 1] = a;
			}
		}
	}
	for (int k = 1; k <= n; ++k)
	{
		for (int i = 1; i <= n; ++i)
		{
			for (int j = 1; j <= n; ++j)
			{      

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			}
		}
	}
	if (d[s][t] == inf)
	{
		cout << -1;
		return 0;
	}
	cout << d[s][t] << endl;

}