#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Yukicoder №11 カードマッチ
// https://yukicoder.me/problems/no/11
// ***********************
// for debug
#define DEBUG

#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 do{printf("\n");fflush(stdout);}while(0)
#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// The out-of-date function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	ctime(...)		ctime_s(...)
#define	strlen(a)	mystr_len(a)

// for stdio
#define	INPUT	GETLINE
#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)
#define lolong long long
#define INPBUF (255+2)
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 GETLINEINT(void) {char s[34];GETLINE(s);return atoi(s);}
static int GETWORDINT(void) {char s[34];GETWORD(s);return atoi(s);}
#define Yes(a)    printf("%s",((a)?"Yes":"No"))
// ***********************
// ***********************
// 外部変数
// ***********************
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;
}