import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner in = new Scanner(System.in);
int a=in.nextInt();
String s=in.next();
StringBuffer s1=new StringBuffer("");
String s2=new String();
for(int j=2;j<=16;j++)
{
for(int i=1;i<=a;i++)
{
s1.append(Integer.toString(i,j));
}
}
s2=s1.toString().toUpperCase();
if(s2.contains(s))
{
System.out.print("yes");
}
else {
System.out.print("no");}
in.close();
}
}
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