#include <bits/stdc++.h>
typedef long long ll;
typedef unsigned long long int ull;
using namespace std;
const ll MOD = (ll)1e9+7;
int MAXN = 1e6;
//classes
//global
int N;
vector<string> vec;
bool isPalindrome(string& str){
int left = 0, right = str.length()-1;
while(left < right){
if(str[left] != str[right]) return false;
left++;
right--;
}
return true;
}
ll convertNum(string& str){
ll ans = 0;
for(char& i: str){
ans *= 10;
ans += i-'0';
}
return ans;
}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(0);
//ifstream fin("hps.in");
//ofstream fout("hps.out");
//stop
cin >> N;
ll sum = 0LL;
vec.assign(N, "");
for(string& i: vec){
cin >> i;
if(isPalindrome(i)){
sum += convertNum(i);
}
}
cout << sum << '\n';
return 0;
}
