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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- ll dp[100010];
- ll a[100010];
- set<int> vr;
- int main()
- {
- ios_base::sync_with_stdio(false);
- cin.tie(NULL);
- int n;
- cin >> n;
- for(int i = 0; i < n; i++)
- {
- int x;
- cin >> x;
- a[x]++;
- vr.insert(x);
- }
- if(vr.size() == 1)
- {
- ll x = *vr.begin();
- cout << a[x]*x;
- return 0;
- }
- dp[0] = 0;
- dp[1]=a[1];
- for(int i = 2; i <= n; i++)
- {
- dp[i] = max(dp[i-1], i*a[i] + dp[i-2]);
- }
- cout << dp[n];
- return 0;
- }
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