#include<bits/stdc++.h>
            #include<ext/pb_ds/assoc_container.hpp>
            #include<ext/pb_ds/tree_policy.hpp>
            using namespace __gnu_pbds;
            using namespace std;
            # define ll long long
            # define int long long  //comment it out when MLE
            //# define endl "\n"
           // template <typename T>
            //using ordered_set = tree<T, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>;

            #define gok ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
            //# define m 163577857
            # define mo 1000000007
            # define pi acos(-1)
            # define fi first
            # define se second
            # define pb push_back
            # define pii pair<int,int>
            #define REP(i,n) for (int i = 1; i <= n; i++)
            const ll mod =  1e9+7;
            //const int K = 2;
            //typedef vector<vector<int> > matrix;
   /*
          int add(int a, int b,int mod) {
                a%=mod;
                b%=mod;
                a += b;
                if (a >= mod) a -= mod;
                if(a<0)
                {
                    a += mod;
                    a %= mod;
                }
                return a;
            }

            int mul(ll a, int b,int mod) {
                a%=mod;
                b%=mod;
                a *= b;
                a += mod;
                return a % mod;
            }
            int po(int a,int b,int mod)
            {
                if(b==0)
                    return 1;
                if(b%2==0)
                    return po(mul(a,a,mod),b/2,mod);
                return mul(a,po(mul(a,a,mod),(b-1)/2,mod),mod);
            }


            ll fact[200003];
            ll inv[200003];

            void fact0()
            {
                int i,j;
                fact[0]=1;
                for(i=1;i<=200000;i++)
                {
                    fact[i]=i*fact[i-1]%mod;
                }
                inv[0]=1;
                inv[1]=1;
                ll p=mod;
                for (i=2; i<=200000; i++)
                    inv[i] = (p - (p/i) * inv[p%i] % p) % p;

                for(i=2;i<=200000;i++)
                {
                    inv[i]*=inv[i-1];
                    inv[i]%=mod;
                }
            }
            int help(int a,int b)
            {
               // cout<<a<<" "<<b<<endl;
                int an = fact[a];
                //cout<<an<<endl;
                an *= inv[b];
                an %= mod;
                an *= inv[a-b];
                an %= mod;
                return an;
            }
/*
          void random()
            {
              srand(time(0));
            for (int i = 0; i < n; i ++)
                perm[i] = i + 1;
            random_shuffle(perm, perm + n);
            }

int ncr(int a,int b)
{
    if(b>a)
        return 0;
    int tt = fact[a];
    tt %= mod;
    tt *= inv[a-b];
    tt %= mod;
    tt *= inv[b];
    tt %= mod;
    return tt;
}
*/
/*
struct tri{
    tri *arr[2];
};

tri *newNode()
{
    tri *temp = new tri;
    //temp->value = 0;
    temp->arr[0] = temp->arr[1] = NULL;
    return temp;
}
void insert(tri *root,int val)
{
    tri *temp = root;
    for (int i=32; i>=0; i--)
    {
        bool idx = ((val&(1ll<<i)));
       // cout<<idx<<" ";
        if(temp->arr[idx]==NULL)
        {
            temp->arr[idx] = newNode();
        }
        temp = temp->arr[idx];
    }
   //cout<<endl;
}
int qry(tri *root,int val)
{
    int an=0;
    tri *temp = root;
    for (int i=32; i>=0; i--)
    {
        if((val&(1LL<<i))>0)
        {
            if(temp->arr[0]!=NULL){
            temp = temp->arr[0];
            an += (1LL<<i);
           // cout<<(1ll<<i)<<" ";
            }
            else if(temp->arr[1]!=NULL)
                temp=temp->arr[1];
            else{

                break;
            }
        }
        else
        {
          if(temp->arr[1]!=NULL){
            temp = temp->arr[1];
            an += (1LL<<i);
           // cout<<(1ll<<i)<<" ";

            }
            else if(temp->arr[0]!=NULL)
                temp=temp->arr[0];
            else{
                 break;
            }
        }
    }
    //cout<<endl;
    return an;
}
*/

signed main(){
	gok

	int a,b,c,d;
	cin>>a>>b>>c>>d;

	cout<<max({a*c,a*d,b*c,b*d});

	/*
    if(a>b)
    swap(a,b);
    if(c>d)
        swap(c,d);
    if(b>0 && d<=0)
        cout<<a*d;
    else if(b<=0 && d>0)
        cout<<b*c;
    else
	cout<<max(a*c,b*d);

*/



























  return 0;
}


Measured memory_bytes: 3688