#import<ios>
int n,z,o=true,i=o;void g(int &a,int b=o){while(b){int t=a;a^=b;b=(t&b)<<!z;}}main(){scanf("%ld",&n);for(g(i);i<n;g(i))n=n%i?n:z;puts(n>o?"YES":"NO");}