import java.io.*; class Main{ static final PrintWriter out=new PrintWriter(System.out); public static void main(String[] args) throws IOException{ BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); String line=""; while((line=br.readLine())!=null&&!line.isEmpty()){ int n=Integer.parseInt(line); int t=Integer.parseInt(br.readLine()); double[][] dp1=new double[61][n+1]; double[][] dp2=new double[61][n+1]; dp1[0][0]=1; dp2[0][0]=1; for(int i=0;i