#include<iostream>
using namespace std;
#define N 101
int n,y,a[N][N],b[N];
struct node
{
int xx,num;
}h[N];
void sb(int x)
{
int head=0,tail=1;
h[tail].xx=x;
h[tail].num=0;
b[x]=1;
while(head<tail)
{
head++;
for(int i=1;i<=n;i++)
{
if(a[i][h[head].xx]==1&&b[i]==0)
{
b[i]=1;
tail++;
h[tail].num=h[head].num;
if(i==y)
{
cout<<h[tail].num;
return;
}
h[tail].xx=i;
h[tail].num++;
}
}
}
}
int main()
{
int hhh;
cin>>n>>hhh>>y;
for(int i=1;i<=n;i++)
{
for(int j=1;j<=n;j++)
{
cin>>a[i][j];
}
}
sb(hhh+1);
return 0;
}