#include <bits/stdc++.h>
using namespace std;

int main() {

	string n; cin >> n;


	if (n[0] == '7' || n[1] == '7' || n[2] == '7') {
		cout << "Yes" << endl;
	}
	else {
		cout << "No" << endl;
	}

	return 0;

}
