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

int n;

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	if(n % 10 == 7 || n / 10 % 10 == 7 || n / 100 == 7) {
		cout << "Yes" << endl;
	} else {
		cout << "No" << endl;
	}
	return 0;
}
