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OI-codes/Codeforces/320/A/A.cpp

33 lines
493 B
C++

#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;
}