#include<bits/stdc++.h> using namespace std; long long x,n,a[50005],maxn,minn,ans=0,i; int main() { while(1) { cin>>n; if(n<=0) { break; return 0; } for(i=1;i<=n;i++) { cin>>a[i]; if(i==1) { maxn=a[i]; minn=a[i]; } else { if(a[i]>maxn) { maxn=a[i]; } if(a[i]<minn) { minn=a[i]; } } } ans=maxn-minn; cout<<ans; } return 0; }