1 #include <bits/stdc++.h>
 2 #define ll long long
 3 #define ull unsigned long long
 4 #define ms(a,b) memset(a,b,sizeof(a))
 5 const int inf=0x3f3f3f3f;
 6 const ll INF=0x3f3f3f3f3f3f3f3f;
 7 const int maxn=1e6+10;
 8 const int mod=1e9+7;
 9 const int maxm=1e3+10;
10 using namespace std;
11 ll Left[maxn];
12 ll Right[maxn];
13 ll a[maxn];
14 int main(int argc, char const *argv[])
15 {
16     #ifndef ONLINE_JUDGE
17         freopen("/home/wzy/in.txt", "r", stdin);
18         freopen("/home/wzy/out.txt", "w", stdout);
19         srand((unsigned int)time(NULL));
20     #endif
21     ios::sync_with_stdio(false);
22     cin.tie(0);
23     int n;
24     ll p,q,r;
25     cin>>n>>p>>q>>r;
26     for(int i=0;i<n;i++)
27         cin>>a[i];
28     Left[0]=a[0]*p;
29     Right[n-1]=a[n-1]*r;
30     for(int i=1;i<n;i++)
31         Left[i]=max(Left[i-1],p*a[i]);
32     for(int i=n-2;i>=0;i--)
33         Right[i]=max(Right[i+1],r*a[i]);
34     ll ans=-INF;
35     for(int i=0;i<n;i++)
36         ans=max(ans,Left[i]+q*a[i]+Right[i]);
37     cout<<ans<<endl;
38     #ifndef ONLINE_JUDGE
39         cerr<<"Time elapsed: "<<1.0*clock()/CLOCKS_PER_SEC<<" s."<<endl;
40     #endif
41     return 0;
42 }