#include<iostream>
using namespace std;
 
class Graph
{
  private: 
  bool orient;
  int n, **arr, shet_reber, *d;
 
  public:
  Graph (int **matrix, int x, int shet)
  {
    n = x;
    arr = matrix;
    shet_reber = shet;
    d = new int[n];
  }
  void minpath(int x);
  int get_length_path(int x, int y);
};

void Graph::minpath(int x)
{ 
  int w, min, j;
  bool *old = new bool[n];
  int *path = new int[n];

  for ( int i = 0; i < n; i++)
  {
    d[i] = arr[x][i];
    old[i] = false;
    path[i] = x;
  }
  
  old[x] = true;
  
 for (int i = 1; i < n; i++)
   {
     for ( w = -1, min = INT8_MAX, j = 0; j < n; j++)
      if (!old[j] && d[j] < min)
      { 
        w = j; 
        min = d[j]; 
      }
     if (w < 0) 
        break;

     for (old[w] = true, j = 0; j < n; j++)
      if (!old[j] && d[j] > d[w] + arr[w][j])
      { 
        d[j] = d[w] + arr[w][j]; 
        path[j] = w; 
      }
  } 

delete [] old;
}

int Graph::get_length_path(int x, int y)
{
 int dlina = 0;
  minpath(x);
 
 int i = y;
 if ( d[i] == INT8_MAX)
  dlina = -1;
 else dlina = d[i];

 return dlina;
}

int main() 
{
 int n, shet_reber = 0, x, y;
 cin >> n >> x >> y;
 
int **arr = new int*[n];

for ( int i = 0; i < n; i++)
     arr[i] = new int[n];
    
for (int i = 0; i < n; i++)
  for (int j = 0; j < n; j++)  
     {
       cin >> arr[i][j];
        if (arr[i][j] != 0)
         shet_reber++;
     }

 Graph object(arr, n, shet_reber);
 
 cout << object.get_length_path(x-1, y-1);
}