import?java.util.*;
import?java.math.*;
public?class?Eat_Candy?{
/**
?*?Creates?a?new?instance?of?<code>Eat_Candy</code>.
?*/
//?public?Eat_Candy()?{
//?}
/**
?*?@param?args
?*the?command?line?arguments
?*/
public?static?void?main(String[]?args)?{
Scanner?reader?=?new?Scanner(System.in);
long?number?=?reader.nextLong();
long?size?=?reader.nextLong();
long?sum?=?0,?max?=?0,?b?=?0;
b?=?reader.nextLong();
for?(long?j?=?0;?j?<?number;?j++)?{
if?(size?<?0?||?size?>?1000000)
break;
for?(long?i?=?0;?i?<?size;?i++)?{
sum?+=?b;
if?(b?>?max)?{
max?=?b;
}
}
if?(sum?-?max?+?1l?>=?max)?{
System.out.println("YES");
}?else
System.out.println("NO");
}
//?TODO?code?application?logic?here
}
}