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class Solution {
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 public:
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  int numRabbits(vector<int> &answers) {
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    sort(answers.begin(), answers.end());
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    int ans = 0;
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    for (int i = 0; i < answers.size(); i++) {
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      ans += answers[i] + 1;
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      int num = answers[i];
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      while (answers[i] == answers[i + 1] && num > 0 && i + 1 < answers.size()) {
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        num--;
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        i++;
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      }
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    }
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    return ans;
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  }
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};