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

int main(){
	ios::sync_with_stdio(0);
	cout << setprecision(10) << fixed;
	string s;
	cin >> s;
	for (int i = 0; i < s.size(); ++i){
		if (s[i] == '7'){
			cout << "Yes";
			return 0;
		}
	}
	cout << "No";
	return 0;
}

