#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#define MAXN 110000
#define LL long long
using namespace std;
int n;
LL m;
int a[MAXN];
int v[MAXN];
LL q[5][MAXN];
int loc[5];
int cnt[5];
int main()
{
    scanf("%d%lld",&n,&m);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&a[i]);
        if(a[i]%5)
        {
            v[i]=5-a[i]%5;
            a[i]+=v[i];
            q[v[i]][++loc[v[i]]]=a[i];
        }
    }
    int ans=m%5;
    m-=ans;

    for(int i=1;i<=4;i++){
        sort(q[i]+1,q[i]+loc[i]+1);
        cnt[i]=1;
    }

    LL w=m;
    while(1)
    {
        bool flag=0;
        int num;
        for(int i=1;i<=4;i++)
        {
            if(w<q[i][cnt[i]] || cnt[i]>loc[i])continue;
            else if(!flag)
            {
                num=i;flag=1;
            }
            else if(1ll * i * q[num][cnt[num]] <= 1ll * num * q[i][cnt[i]])
            {
                num=i;
            }
        }
        if(!flag)break;
        w-=q[num][cnt[num]++];
    }
    for(int i=1;i<=4;i++)cnt[i]--;
    for(int i=1;i<=4;i++)
        for(int j=1;j<=loc[i];j++)
            q[i][j]+=q[i][j-1];
    int out=ans;
    for(int i=max(cnt[1]-50,0);i<=min(cnt[1]+50,loc[1]);i++)
        for(int j=max(cnt[2]-50,0);j<=min(cnt[2]+50,loc[2]);j++)
            for(int k=max(cnt[3]-50,0);k<=min(cnt[3]+50,loc[3]);k++)
                for(int l=max(cnt[4]-50,0);l<=min(cnt[4]+50,loc[4]);l++)
                {
                    int v = i + 2*j +3*k +4*l;
                    LL sp = q[1][i] + q[2][j] + q[3][k] + q[4][l];
                    if(sp<=m)
                        out=max(out,ans+v);
                }
    cout<<out<<endl;
    return 0;
}