#include using namespace std; int main(){ int n; double in_num; double maxx,minn;

cin>>n;
cin>>in_num;
maxx=in_num;
minn=in_num;

for(int i = 1 ; i < n ; i++){
	cin>>in_num;
	if(in_num>maxx)maxx=in_num;
	if(in_num<minn)minn=in_num;
	
}
cout<<maxx-minn;
return 0;

}