import java.io.*; import java.util.*; class Main { static final long MOD=1000000007; public static void main(String[] args) { Scanner sc = new Scanner(System.in); int n=sc.nextInt(); int k=sc.nextInt(); int s=n*(n-1)/2+1; long[][]dp=new long[2][s]; dp[0][0]=1; for(int i=0;i