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#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
// 请在此输入您的代码
int n,i;
scanf("%d",&n);
for(i=1;i<=n/2;i++)
{
printf("%d\n",2*n-2*i);
}
if(n%2!=0)
{
printf("%d\n",n-1);
}
for(i=n/2;i>0;i--)
{
printf("%d\n",2*n-2*i);
}
return 0;
}