#include <bits/stdc++.h>
using namespace std;
int arr[51][33][33];
int main(){
	int N, A, B, C;
	char ch;
	while(cin>>N){
		for(int i=0; i<N; i++)
			for(int j=0; j<N; j++){
				cin>>ch;
				arr[1][i][j]=ch-'0';
			}
		int ans=0;
		cin>>A>>B>>C;
		for(int c=2; c<=C; c++)
			for(int i=0; i<N; i++)
				for(int j=0; j<N; j++)
					arr[c][i][j]=0;
 
		for(int c=1; c<C; c++){
			for(int i=0; i<N; i++)
				for(int j=0; j<N; j++)
					for(int k=0; k<N; k++)
						arr[c+1][i][j]+=arr[c][i][k]*arr[1][k][j];
			ans+=arr[c][A-1][B-1];
		}ans+=arr[C][A-1][B-1];
		cout<<ans<<'\n';
	}
}

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5
01000
10001
00011
00101
01110
3
5
3
7
0101000
1011000
0100000
1100110
0001010
0001101
0000010
1
7
5