#include using namespace std; #if __has_include() #include using namespace atcoder; using mint = modint1000000007; #endif using ll = long long; using ld = long double; const ll INF = 1ll<<60; const ld EPS = 1.0/1e9; #define endl "\n" #define rep(i,a,b) for(int i=a;i=b;i--) #define fore(i,a) for(auto &i:a) #define all(x) (x).begin(),(x).end() #define del(x) sort(all(x)); x.erase(unique(all(x)),x.end()); int main(){ ios_base::sync_with_stdio(0); cin.tie(0); string s; cin >> s; if(s[0]=='4'||s[0]=='5') cout << "Yes"; else cout << "No"; }