#include <iostream>
#include <fstream>

using namespace std;

ifstream fin ("numere.txt");
ofstream fout ("numere.out");

long long vf[101];
int main()
{
    long long n,x,i,k;
    fin>>n;
    for(i=1;i<=n;i++)
    {

        fin>>x;
        vf[x]++;
    }

    k=0;
    for(i=1;i<=100;i++)
        {

            if(vf[i]==0)
             {
                 k++;
                 fout<<i<<" ";
             }

        }

        if(k==0)
            fout<<"NU LIPSESTE NICIUN NUMAR";

    return 0;
}