#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <math.h>
// №
// ***********************
// for debug
#define DEBUGf

#define NOP do{}while(0)
#ifdef DEBUG
#define TRACE(...) do{printf(__VA_ARGS__);fflush(stdout);}while(0)
#define TRACECR do{printf("\n");fflush(stdout);}while(0)
#else
#define TRACE(...) NOP
#define TRACECR NOP
#endif

#define PRINCR printf("\n")
#define NOCR(strig) do{char *p;p=strchr(strig,'\n');if(p)*p='\0';}while(0)
// The out-of-date function
#define	asctime(...)	asctime_s(...)
#define	atof(a)		strtod(a,'\0')
#define	atoi(a)		((int)strtol(a,'\0'))
#define	atol(a)		strtol(a,'\0')
#define	ctime(...)		ctime_s(...)
#define	strlen(a)	mystr_len(a)
//#define	fopen(...)		fopen_s(...)
//#define	freopen(...)	freopen_s(...)
//#define	rewind(a)		fseek(a,0L,SEEK_SET)
//#define	setbuf(a,b)		setvbuf(a,b,_IOFBF,BUFSIZ)

// for stdio
#define INPUT(str) do{char *p;fgets(str,sizeof(str),stdin);p=strchr(str,'\n');if(p)*p='\0';}while(0)
#define mygc(c) (c)=getchar()
static char *getinput( char* str );
static void read1(int *x){int k,m=0;*x=0;for(;;){mygc(k);if(k=='-'){m=1;break;}if('0'<=k&&k<='9'){*x=k-'0';break;}}for(;;){mygc(k);if(k<'0'||k>'9')break;*x=(*x)*10+k-'0';}if(m)(*x)=-(*x);}
static void read2(int *x, int *y){read1(x);read1(y);}
static char *getinput(char* str) {char c;char *cp;cp=&str[0];c=fgetc(stdin);while( c != EOF ){if((c==' ')||( c=='\n')) break;*cp++=c;c=fgetc(stdin);}*cp='\0';return &str[0];}
static int max(int a,int b){if(a>b){return a;}return b;}
static int min(int a,int b){if(a<b){return a;}return b;}
// for readaility
typedef	long long	lolong;
const int	INF = 1e9;
const int	MOD = 1e9+7;
const lolong	LINF = 1e18;
#define PI	  ((double)3.141592653589793238462643383279)
#define	YES(a)	printf("%s",((a)?"YES":"NO"))
#define	Yes(a)	printf("%s",((a)?"Yes":"No"))
#define OK(a)	printf("%s",((a)?"OK":"NG"))
#define Ok(a)	printf("%s",((a)?"Ok":"Ng"))
#define	POSSIBLE(a)		printf("%s",((a)?"POSSIBLE":"IMPOSSIBLE"))
#define	Possible(a)		printf("%s",((a)?"Possible":"Impossible"))
#define SWAP(type,a,b) do{type _c;_c=a;a=b;b=_c;}while(0)
#define REP(a,b) for(int a=0;a<(int)(b);++a)
#define REP1(a,b) for(int a=1;a<=(b);++a)
#define FLOOP(a,b) for(a=0;a<(b);++a)
#define FLOOP1(a,b) for(a=1;a<=(b);++a)
#define	ABS(c)	 ((c)<0?(-(c)):(c))
#define LSB(i) ((i) & -(i))

#define INPBUF (30+3)
#define	data_s	int
// ***********************
// ***********************
static int cmpint_asc(const void *a,const void *b){if(*(int *)a>*(int *)b){return 1;}if(*(int *)a==*(int *)b){return 0;}return -1;}
static int cmpint_desc(const void *a,const void *b){if(*(int *)a<*(int *)b){return 1;}if(*(int *)a==*(int *)b){return 0;}return -1;}
static int cmpchar_asc(const void *a,const void *b){if(*(char *)a>*(char *)b){return 1;}if(*(char *)a==*(char *)b){return 0;}return -1;}
static int cmpchar_desc(const void *a,const void *b){if(*(char *)a<*(char *)b){return 1;}if(*(char *)a==*(char *)b){return 0;}return -1;}
static int mystr_len(char *str){int i=0;do{if(str[i]=='\0')break;i++;if(i>9999)break;}while(1);return i;}
// ***********************
// https://yukicoder.me/problems/no/885
// ***********************
// ***********************
// ***********************
// ***********************
// ***********************
// 外部変数
// ***********************
int main() {
	char	str[10*5+3];
	int		human;
	int		heal;
	long		hoimi,behomalar;
	int		val;
	int		nokori;
	int		saidai;
	int		sinikake;
	int     henka;
	long	used = 0L;
	int		*nlp;

    INPUT( str );
	sscanf( str,"%d %d %ld %ld", &human , &heal, &hoimi, &behomalar );
	nlp = malloc( sizeof( int ) * human );
	REP(i,human) {
        getinput( str );
		sscanf( str ,"%d", &val );
		nlp[i] = val - 1;
	}

	nokori = 0;
	saidai = 0;
	sinikake = 0;
	REP(i,human) {
		if( saidai < nlp[i] ) {
			saidai =  nlp[i];
			sinikake = i;
		}
		if( nlp[i] > 0 ) nokori++;
	}
	qsort( nlp , human , sizeof(int) , cmpint_asc );
	TRACE("nokori%d,used %d\n", nokori, used );
	while( nokori ) {
		REP(ji,human) TRACE(",%d",nlp[ji]); TRACECR;
		if( (hoimi * nokori) > behomalar ) {
		    TRACE("BEHOMALAR!\n");
			henka = 0;
			while( !henka ) {
				used += behomalar;
				REP(ji,human) {
					if( nlp[ ji ] > 0 ) {
						nlp[ ji ] -= heal;
						if( nlp[ ji ] <= 0 ) {
							nlp[ ji ] = 0;
							henka = 1;
						}
					}
				}
			}
		} else {
		    int ima;
		    TRACE("HOIMI!\n");
		    for(ima=0;nlp[ ima ] == 0; ima++);
			henka = 0;
			while( !henka ) {
				used += hoimi;
				nlp[ ima ] -= heal;
				if( nlp[ ima ] <= 0 ) {
					nlp[ ima ] = 0;
					henka = 1;
					break;
				}
			}
		}
		// -------------
		nokori = 0;
		saidai = 0;
		REP(i,human) {
			if( saidai < nlp[i] ) {
				saidai =  nlp[i];
				sinikake = i;
			}
			if( nlp[i] > 0 ) nokori++;
		}
		TRACE("nokori%d,used %d\n", nokori, used );
	}
	printf("%ld\n", used );
	free( nlp );
}