#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
#pragma GCC optimize ("O4")
#pragma GCC optimize ("fast-math")
#pragma GCC optimize ("unroll-loops")
using namespace std;
#define int long long
#define ll long long
#define XX first
#define YY second
#define pb push_back
#define sz (x) int(x.size())
#define pf pop_front
#define pob pop_back
#define pff push_front
int solve (int n){
int ans = 0;
while (n){
ans = ans * 10 + n % 10;
n /= 10;
}
return ans;
}
signed main(void){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n;
cin >> n;
int sum = 0;
for (int i = 0; i < n; ++ i){
int x;
cin >> x;
if (x == solve(x))
sum += x;
}
cout << sum;
return 0 ^ 0;
}
