diff --git a/matrix b/matrix
new file mode 100644
index 0000000..eb87526
--- /dev/null
+++ b/matrix
@@ -0,0 +1,28 @@
+import java.util.Scanner;
+public class College
+{
+public static void main(String args[]) 
+{
+Scanner sc=new Scanner(System.in);
+int N;
+N=sc.nextInt();
+boolean b = true;
+for (int i = 0; i < N; i++) {
+for (int j = 0; j < N; j++) {
+if (i == j) {
+System.out.print("1 ");
+}
+else if (b) {
+System.out.print("2 ");
+b = false;
+} 
+else 
+{
+System.out.print("-2 ");
+b = true;
+}
+}
+System.out.println();
+}
+}    
+}