var a:array[1..100000] of longint;
   i,n,min,max:longint;
begin
read(n);
for i:=1 to n do
read(a[i]);
min:=100000;
for i:=1 to n do
begin
if a[i]>max then max:=a[i];
if a[i]<min then min:=a[i];
end;
write(max-min);
end.
/**************************************************************
	Problem: 1809
	User: admin
	Language: Pascal
	Result: Wrong Answer
****************************************************************/