#include<bits/stdc++.h>
using namespace std;
int s,l,m,a[1000000];
int main(){
	cin>>s>>l>>m;
	for(int i=1;i<=m;i++){
		cin>>a[i];
	}
	a[m+1]=s;
	for(int i=0;i<=m;i++){
		if(a[i+1]-a[i]>l){
			cout<<s-a[i]-l;
			return 0;
		}
	}
	cout<<"Happy";
	return 0;
	
}

#include <cstdio> #include <iostream> #include <algorithm> #include <string> using namespace std;

int main() { int s,l,m; bool flag = true; cin >> s >> l >> m; int d = 0,x = 0; for(int i = 1;i <= m;i++) { int n; cin >> n; if(n - d > l) { x = d + l; flag = false; break; } d = n; } if(s - d > l) { x = d + l; flag = false; } if(flag) cout << "Happy" <<endl; else cout << s - x << endl; return 0; }

#include<bits/stdc++.h> using namespace std; int s,l,m,a[1000000]; int main(){ cin>>s>>l>>m; for(int i=1;i<=m;i++){ cin>>a[i]; } a[m+1]=s; for(int i=0;i<=m;i++){ if(a[i+1]-a[i]>l){ cout<<s-a[i]-l; return 0; } } cout<<"Happy"; return 0;

}