#include<iostream> using namespace std; int main() { int k; cin>>k; int n; cin>>n; int t[10001]={0},sg; while(k--){ cin>>sg; t[sg]++; } int mx = 0; for(int i=1;i<=n;i++){ if(t[i]>mx){ mx=t[i]; } } if(n%2==0){ if(mx<=n/2){ cout<<"Y"<<endl; }else{ cout<<"N"<<endl; } }else{ if(mx<=n/2+1){ cout<<"Y"<<endl; }else{ cout<<"N"<<endl; } } return 0; }