#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<iostream>
#include<algorithm>
using namespace std;

unsigned int N,M,dp[2][3001],nx[2][3001],a[3000];
int main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin>>N>>M;
  for(unsigned int i=0;i<N;++i)cin>>a[i];
  sort(a,a+N,greater<unsigned int>());
  for(unsigned int i=0;i<N-1;++i){
    unsigned int x=a[i]-a[i+1];
    for(unsigned int j=0;j<=M;++j){
      nx[0][j]=max(dp[0][j],dp[1][j]);
      if(j+x<=M)nx[1][j+x]=dp[0][j]+a[i];
    }
    swap(dp,nx);
  }
  unsigned int ans=0;
  for(int i=0;i<2;++i)for(unsigned int j=0;j<=M;++j)if(ans<dp[i][j])ans=dp[i][j];
  cout<<ans<<'\n';
}