s = str(input())
c1 = s.count("1")
c14 = s.count("14")
c144 = s.count("144")
if c1 + c14 + c144 == len(s):
print("YES")
else:
print("NO")
349A - Cinema Line | 47A - Triangular numbers |
1516B - AGAGA XOOORRR | 1515A - Phoenix and Gold |
1515B - Phoenix and Puzzle | 155A - I_love_username |
49A - Sleuth | 1541A - Pretty Permutations |
1632C - Strange Test | 673A - Bear and Game |
276A - Lunch Rush | 1205A - Almost Equal |
1020B - Badge | 1353A - Most Unstable Array |
770A - New Password | 1646B - Quality vs Quantity |
80A - Panoramix's Prediction | 1354B - Ternary String |
122B - Lucky Substring | 266B - Queue at the School |
1490A - Dense Array | 1650B - DIV + MOD |
1549B - Gregor and the Pawn Game | 553A - Kyoya and Colored Balls |
1364A - XXXXX | 1499B - Binary Removals |
1569C - Jury Meeting | 108A - Palindromic Times |
46A - Ball Game | 114A - Cifera |