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#include<bits/stdc++.h>
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using namespace std;
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//<2F>ݹ鷽<DDB9><E9B7BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>n<EFBFBD>ʺ<EFBFBD><CABA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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//ÿ<>ҵ<EFBFBD>һ<EFBFBD>ֺڻʺ<DABB><CABA>ڷŷ<DAB7>ʽ<EFBFBD><CABD><EFBFBD><EFBFBD><EFBFBD>ڴ˻<DAB4><CBBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ҳ<EFBFBD><D2B3><EFBFBD><EFBFBD>аʺ<D7BB><CABA>ڷŷ<DAB7>ʽ
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using namespace std;
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int warray[9] = {0}; //<2F><><EFBFBD>ڴ<EFBFBD><DAB4>Űʺ<D7BB>λ<EFBFBD><CEBB> warray[1] = 2,<2C><>ʾ1<CABE><31>2<EFBFBD><32><EFBFBD>аʺ<D7BB>
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int barray[9] = {0}; //<2F><><EFBFBD>ڴ<EFBFBD><DAB4>źڻʺ<DABB>λ<EFBFBD><CEBB>
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int vis[9][9] = {0}; //<2F><><EFBFBD>ڴ<EFBFBD><DAB4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int n;
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int cnt = 0; //<2F><>¼<EFBFBD>ڷŷ<DAB7><C5B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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int whiteQuene(int x){ //<2F>ڷŰʺ<D7BB>
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if(x > n){
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cnt++;
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return 0;
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}
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for(int tj = 1;tj <= n;tj++){
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if(!vis[x][tj] || tj == barray[x]){
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continue;
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}
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int j = 1;
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while(j < x){ //<2F><><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ͬ<EFBFBD>л<EFBFBD><D0BB>߶Խ<DFB6><D4BD><EFBFBD><EFBFBD>Ѵ<EFBFBD><D1B4><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><CDAC>ɫ<EFBFBD>ʺ<EFBFBD>
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if(warray[j] == tj || fabs(j - x) == fabs(warray[j] - tj)){
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break;
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}
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j++;
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}
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if(j == x){
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warray[x] = tj;
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whiteQuene(x + 1);
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}
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}
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return 0;
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}
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int blackQuene(int x){ // <20>ڷźڻʺ<DABB>
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if(x > n){
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whiteQuene(1); //ÿ<><C3BF><EFBFBD>ڻʺ<DABB><CABA>ڷ<EFBFBD><DAB7><EFBFBD>һ<EFBFBD>֣<EFBFBD><D6A3>Ϳ<EFBFBD>ʼ<EFBFBD>ڷŰʺ<D7BB>
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return 0;
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}
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for(int tj = 1;tj <= n;tj++){
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if(!vis[x][tj]){
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continue;
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}
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int j = 1;
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while(j < x){ //<2F><><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD>ͬ<EFBFBD>л<EFBFBD><D0BB>߶Խ<DFB6><D4BD><EFBFBD><EFBFBD>Ѵ<EFBFBD><D1B4><EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><CDAC>ɫ<EFBFBD>ʺ<EFBFBD>
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if(barray[j] == tj || fabs(x - j) == fabs(tj - barray[j])){
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break;
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}
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j++;
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}
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if(j == x){
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barray[x] = tj;
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blackQuene(x + 1);
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}
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}
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}
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int main()
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{
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cin>>n;
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for(int i = 1;i <= n;i++){
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for(int j = 1;j <= n;j++){
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int t;
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cin>>t;
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vis[i][j] = t;
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}
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}
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blackQuene(1);
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cout<<cnt;
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return 0;
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}
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