#include<iostream>

 #include<cstdio>

 #include<cstring>

 #include<cmath>

 #include<algorithm>

 #define LL long long

 #define maxn 1100000

 #define IN freopen("in.txt","r",stdin);

 using namespace std;

 int n,k;

 int bits[];

 int main(int argc, char const *argv[])

 {

     //IN;

     while(scanf("%d %d",&n,&k)!=EOF)

     {

         memset(bits,,sizeof(bits));

         for(int i=; i<=n; i++){

             int x;scanf("%d",&x);

             int j = ;

             while(x!=){

                 bits[j] += x%;

                 j++;

                 x /= ;

             }

         }

         int ans = ;

         for(int i=; i<=; i++){

             int tmp = bits[i];

             if(tmp%k == ) continue;

             ans += (<<i);

         }

         printf("%d\n", ans);

     }

     return ;

 }