#include<bits/stdc++.h> using namespace std; #define ll long long ll a[200010],ans; ll fun(ll x) { ll res=0; while(x) { res+=x%10; x-=x%10; x/=10; } return res; } int main() { int n; cin>>n; for(int i=1;i<=n;i++){ cin>>a[i]; } for(int k=1;k<=n;k++){ for(int i=1;i<=n;i++){ ans+=fun(a[i]+a[k]); } } cout<<ans<<endl; return 0; }