#include <stdio.h>
int main()
{
	int n,b,minn=0x3f3f3f3f,maxx=0;
	scanf("%d",&n);
	for(;n>0;n--)
	{
		scanf("%d",&b);
		if(b<=minn)
		{
			minn=b;
		}
		else if(b>minn && b>=maxx)
		{
			maxx=b;
		}
	}
	printf("%d",maxx-minn);
	return 0;
}