A - Magic Numbers

https://codeforces.com/contest/320/submission/178748089

Codeforces/320/A/A.cpp

@@ -0,0 +1,32 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int n;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> n;
+
+    while (n) {
+        if (n % 10 == 1) {
+            n /= 10;
+        } else if (n % 100 == 14) {
+            n /= 100;
+        } else if (n % 1000 == 144) {
+            n /= 1000;
+        } else {
+            cout << "NO" << endl;
+
+            exit(0);
+        }
+    }
+
+    cout << "YES" << endl;
+
+    return 0;
+}