func_code_string: #include <bits/stdc++.h>   long long int a[100005], c[100005], s[100005];   using namespace std;   int main() {     int n;     cin >> n;     for (int i = 1; i <= n; i++) {       cin >> a[i];       c[a[i]]++;     }     s[0] = 0;     s[1] = c[1];     for (int i = 2; i <= 100000; i++) {       s[i] = max(s[i - 1], (s[i - 2] + c[i] * i));     }     cout << s[100000];     return 0;   }   