#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; }