#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; bool pali(int x) { int first=x; int second=0; while(x) { second=10*second+x%10; x/=10; } return (first==second); } int32_t main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n; cin>>n; ll r=0LL; for(int i=1;i<=n;i++) { int x; cin>>x; if(pali(x)) { r+=x; } } cout<<r<<"\n"; return 0; } /** **/