#include<bits/stdc++.h>
using namespace std;
namespace IO{
	template<typename T>inline bool read(T &x){
		x=0;
		char ch=getchar();
		bool flag=0,ret=0;
		while(ch<'0'||ch>'9') flag=flag||(ch=='-'),ch=getchar();
		while(ch>='0'&&ch<='9') x=x*10+ch-'0',ch=getchar(),ret=1;
		x=flag?-x:x;
        return ret;
	}
	template<typename T,typename ...Args>inline bool read(T& a,Args& ...args){
	    return read(a)&&read(args...);
	}
	template<typename T>void prt(T x){
		if(x>9) prt(x/10);
		putchar(x%10+'0');
	}
	template<typename T>inline void put(T x){
		if(x<0) putchar('-'),x=-x;
		prt(x);
	}
	template<typename T>inline void put(char ch,T x){
		if(x<0) putchar('-'),x=-x;
		prt(x);
		putchar(ch);
	}
	template<typename T,typename ...Args>inline void put(T a,Args ...args){
	    put(a);
		put(args...);
	}
	template<typename T,typename ...Args>inline void put(const char ch,T a,Args ...args){
	    put(ch,a);
		put(ch,args...);
	}
	inline void put(string s){
		for(int i=0,sz=s.length();i<sz;i++) putchar(s[i]);
	}
	inline void put(const char* s){
		for(int i=0,sz=strlen(s);i<sz;i++) putchar(s[i]);
	}
}
using namespace IO;
#define int __int128
#define N 1000005
int n,A,B,C,w[N],f[N],X[N],Y[N];
int q[N];
signed main(){
	read(n,A,B,C);
	for(int i=1;i<=n;i++) read(w[i]),w[i]+=w[i-1];
	int head=1,tail=0;
	q[++tail]=0;
	for(int i=1;i<=n;i++){
		while(head<tail&&2ll*A*w[i]*(X[q[head+1]]-X[q[head]])<=Y[q[head+1]]-Y[q[head]]) head++;
		f[i]=f[q[head]]+A*(w[i]-w[q[head]])*(w[i]-w[q[head]])+B*(w[i]-w[q[head]])+C,X[i]=w[i],Y[i]=f[i]+A*w[i]*w[i]-B*w[i];
		while(head<tail&&(Y[i]-Y[q[tail-1]])*(X[q[tail]]-X[q[tail-1]])>=(Y[q[tail]]-Y[q[tail-1]])*(X[i]-X[q[tail-1]])) tail--;
		q[++tail]=i;
	}
	put('\n',f[n]);
	return 0;
}