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

int main() {

	int n;
	cin >> n;

	if(n % 10 == 7) {
		cout << "Yes\n";
		return 0;
	}

	n /= 10;

	if(n % 10 == 7) {
		cout << "Yes\n";
		return 0;
	}

	n /= 10;
	
	if(n % 10 == 7) {
		cout << "Yes\n";
		return 0;
	}

	cout << "No\n";

	return 0;
}
