#include<bits/stdc++.h> using namespace std; int main() { int M,a[10001]{},max,min,b,i; cin>>M; for(int i=1;i<=m;i++){ cin>>a[i]; if(i==1) max=min=a[i]; if(a[i]>max) max=a[i]; if(a[i]<min) min=a[i]; } b=max-min; cout<<b<<endl return 0; }