#include <iostream> #include <cstdio> using namespace std; int main(){ int k,j,n,m,l; cin>>n>>m; int v[101][101]; for(k=1;k<=n;k++){ for(j=1;j<=n;j++){ cin>>v[k][j]; if(k==j||k+j==n+1) v[k][j]+=m;} } for(k=1;k<=n;k++){ for(j=1;j<=n;j++) l+=v[k][j];} cout<<l; return 0; }