#include<iostream>
using namespace std;
int main() {
	int N;
	cin >> N;
	if (N % 10 == 7 || (N % 100) / 10 == 7 || N / 100 == 7) {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}
	return 0;
}