#include<iostream>
#include<string>
using namespace std;
int main() {
	string N;
	cin >> N;
	bool ans = false;
	for (int i = 0; i < 3; i++) {
		if (N[i] == '7') ans = true;
	}
	if (ans) cout << "Yes" << endl;
	else cout << "No" << endl;
}