#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ int m,a[10010],minn=10010,maxn=-10010; cin>>m; for(int i=1;i<=m;i++){ cin>>a[i]; if(maxn<a[i]) maxn=a[i]; if(minn>a[i]) minn=a[i]; } cout<<maxn-minn<<endl; return 0; }