#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<utility>
#include <functional>
#include <set>
#include <map>
#include <queue>
#include <cmath>
#include <stack>

using namespace std;


int main() {
	
	int n;
	cin >> n;
	while (n > 0) {
		if (n % 10 == 7) {
			cout << "Yes";
			return 0;
		}
		n /= 10;
	}
	cout << "No";
}