#include<iostream>
#include<algorithm>
#include<functional>
#include<cmath>
#include<string>
#include<vector>
#include<stack>
#include<queue>
#include<map>
#include<deque>
using namespace std;
#define ll long long
const int mod = 1000000007;
const ll INF = 1000000000000000000;

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