#include<bits/stdc++.h> using namespace std; int main() { int a[11],maxn=1,minn,n; cin>>n; for(int i=1;i<=n;i++) { cin>>a[i]; minn=a[1]; if(a[i]>maxn) { maxn=a[i]; } if(a[i]<minn) { minn=a[i]; } } cout<<maxn-minn<<endl; return 0; }