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

string s;

int main()
{
	cin >> s;
	for (int i = 0; i < 3; i++)
	{
		if (s[i] == '7')
		{
			cout << "Yes" << endl;
			exit(0);
		}
	}
	cout << "No" << endl;
	return 0;
}
