#include <stdio.h>
#include <stdlib.h>
#include <string.h>
extern int getchar_unlocked(void);
extern int putchar_unlocked(int);
#define gc(d)	(d)=getchar_unlocked()
static char *GETWORD(char* str) {char c;char *cp;cp=&str[0];gc(c);while(c!=EOF){if((c==' ')||(c=='\n'))break;*cp++=c;gc(c);}*cp='\0';return &str[0];}
#define GETLINE(str) do{char *p;fgets(str,sizeof(str),stdin);p=strchr(str,'\n');if(p)*p='\0';}while(0)
static int GETLINEINT(void) {char s[34];GETLINE(s);return atoi(s);}
#define YES(a)    printf("%s",((a)?"YES":"NO"))
// *********************
int	take[] = {1,3,9,27,81,243,729,2187,6561,19683,59049,117147,531441
,1594323,4782969,14348907,43046721,129140163,387420489 };
// *********************
int main( void ) {
	YES( !(GETLINEINT() & 1) );
}