//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//  MMMMMMMMMMMMMMMMNOtXtdMMMMMNxzZMMNmgHyVVVVVW%..?/(.,(x-..........(HfffpffpffpffWHHffpffppfVyyWMMMMMM


//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

int main() {

    while (true) {

        int n;
        cin >> n;

        if (n == 0) break;

        vector<int> a(n), b;
        for (int i = 0; i < n; i++) cin >> a[i];
        for (int i = 1; i <= 2 * n; i++) if (find(a.begin(), a.end(), i) == a.end()) b.push_back(i);
        sort(a.begin(), a.end());

        bool is_A = true;
        int last = 0;
        while (true) {
            if (a.size() == 0 || b.size() == 0) break;
            if (is_A) {
                auto it = upper_bound(a.begin(), a.end(), last);
                if (it == a.end()) {
                    last = 0;
                    is_A = false;
                    continue;
                }
                last = *it;
                a.erase(it);
                is_A = !is_A;
            } else {
                auto it = upper_bound(b.begin(), b.end(), last);
                if (it == b.end()) {
                    last = 0;
                    is_A = true;
                    continue;
                }
                last = *it;
                b.erase(it);
                is_A = !is_A;
            }
        }

        cout << b.size() << endl << a.size() << endl;
    }

    return 0;
}






































Measured memory_bytes: 3104