#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<iomanip>
#include<set>
#include<queue>

using namespace std;

int main()
{
	string s;
	cin >> s;
	if(s[0]=='7' or s[1]=='7' or s[2]=='7')
		cout << "Yes" << endl;
	else 
		cout << "No" << endl;




}
