#include <iostream>
#include <vector>
#include <queue>
using namespace std;
#define N 101
vector <int> mas[N];
int res[N];
int used[N];
int n;
void bfs(int start, int finish) {
    queue <int> q;
    q.push(start);
    used[start] = 1;
    while (q.size() != 0) {
        start = q.front();
        q.pop();
        for (int i = 0; i < n; i++) {
            if (used[i] == 0 && mas[start][i] != -1) {
                q.push(i);
                used[i] = 1;
            }
            int per = res[start] + mas[start][i];
            if (res[i] != 0 && mas[start][i] != -1 && res[i] > per) {
                res[i] = per;
                q.push(i);
            }
        }
    }
}
int main() {
    int start, finish;
    cin >> n >> start >> finish;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            int x;
            cin >> x;
            mas[i].push_back(x);
        }
    }
    for (int i = 0; i < n; i++) res[i] = 1000000;
    res[start - 1] = 0;
    bfs(start - 1, finish - 1);
    int way = res[finish - 1];
    if (way != 1000000) cout << way;
    else cout << "-1";
    return 0;
}