#include<stdio.h>
int main()
{
	int a[20],b[20]; 
	int n,i,j,t,mid;
	scanf("%d",&n);
	for(i=0;i<n;++i)
	scanf("%d",&a[i]);
	for(i=0;i<n;++i)
	for(j=0;j<n-1-i;++j)
	{
		if(a[j]>a[j+1]){
		t=a[j];a[j]=a[j+1];a[j+1]=t;
}
	}
	for(i=0;i<n;++i)
	b[i]=a[i];
	mid=(1+n)/2-1;a[mid]=a[n-1];
	printf("%d ",a[0]);
	for(i=1,j=0;i<mid;++i)
	{
		j=j+2;
		a[i]=a[j];
		printf("%d ",a[i]);
		
	}
	printf("%d ",a[mid]);	

for(i=mid+1,j=n;i<n;++i)
	{
		j=j-2;b[i]=b[j];
		printf("%d ",b[i]);
		
	}

}