#include <stdio.h>
#include <stdlib.h>
int main()
{
	int n;
	scanf("%d",&n);
	if(n>90)
		printf("yes\n");
	return 0;
}
//Author: ITProgrammer
/**************************************************************
	Problem: 1301
	User: admin
	Language: C
	Result: Accepted
	Time:9 ms
	Memory:1144 kb
****************************************************************/