#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <map>

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