import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); while(sc.hasNext()){ int n=sc.nextInt(); long []a=new long[1000]; a[1]=1; int sumA=0; for (int i =1; i <=n/2; i++) { int sum=0; for (int j =1; j <=i/2; j++) { sum+=a[j]; } a[i]=sum+1; sumA+=a[i]; } a[n]=sumA+1; System.out.println(a[n]); } } }
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