int main()
{
int n = 0;
scanf("%d",&n);
int i = 0;
int score = 0;
int max = 0;
int min = 100;
for(i=0;i<n;i++)
{
scanf("%d",&score);
if(score>max)
max=score;
if(score<min)
min=score;
}
printf("%d\n",max-min);
return 0;
}