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