#include<bits/stdc++.h>
#define ll long long
using namespace std;
int main()
{
	string s;
	cin>>s;
	for(int i=0; i<s.length(); i++)
	{
		if(s[i]=='7')
		{
			cout<<"Yes\n";
			return 0;
		}
	}
	cout<<"No\n";
}