#include"stdio.h" main() { int n,i,d,s; int a[100]; while(scanf("%d",&n)!=EOF) while(n--);

#include"stdio.h"main(){ int n,i,d,s; int a[100]; while(scanf("%d",&n)!=EOF) { while(n--); { if(n<=4) s=n; else n=n-3; d=4; for(i=1;i<n;i++) a[i]=n-d; s=n+a[i]; d=d+1; } printf("%d\n",s);//