#include <stdio.h>
#include <stdlib.h>
#define PRINCR do{printf("\n");fflush(stdout);}while(0)
#define GETLINE(str) do{char *p;fgets(str,sizeof(str),stdin);p=strchr(str,'\n');if(p)*p='\0';}while(0)
#define REP(a,b) for(int a=0;a<(int)(b);++a)
static char *GETWORD(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];}
#define	GETINTS(a,b) {char s[34];int *ap=a;REP(i,b){GETWORD(s);sscanf(s,"%d", ap);ap++;}}
static int GETWORDINT(void) {char s[34];GETWORD(s);return atoi(s);}
#define Yes(a)  printf("%s",((a)?"Yes":"No"))
int main() {
	int		query,aim;
	int		imax,imin;
	imax = 0;
	imin = 99999;
	query = GETWORDINT();
	aim = GETWORDINT();
	REP(i,query) {
		int val = GETWORDINT();
		if( val < imin ) imin = val;
		if( val > imax ) imax = val;
	}
	if(( imin <= aim )&&( aim <= imax )) Yes(1);
	else    Yes(0);
	PRINCR;
	return 0;
}