#include <fstream>

using namespace std;
ifstream f("aparitii.in");
ofstream g("aparitii.out");
int v[100001],n,k,t,i,j;
int main()
{f>>n>>k;
for(i=1;i<=n;i++){
    f>>v[i];}
for(i=1;i<=n;i++){
    if(v[i]!=0){
        t=1;
        for(j=i+1;j<=n;j++){
            if(v[j]==v[i]){

                t++;
                v[j]=0;}}

        if(t%k!=0){
            g<<v[i];
            break;}
        v[i]=0;}}


    return 0;
}