http://poj.org/problem?id=1671 import java.util.*; public class Main{ static double dp[][]=new double[51][51]; static { dp[1][1]=1; for (int i=2;i<=50;i++) for(int j=1;j<=50;j++) dp[i][j]=dp[i-1][j-1]+dp[i-1][j]*j; } public static void main(String args[]){ Scanner sc=new Scanner(System.in); while (sc.hasNext()) { int n=sc.nextInt(); if(n==0) break; double ans=0; for (int i=1;i<=n;i++) ans+=dp[n][i]; System.out.printf("%d %.0fn",n,ans); } } }
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