# include<iostream>
# include<cstring>
using namespace std;
int main()
{
	string s;
	cin>>s;
	bool ok = false;
	for(int i=0;i<s.length();i++)
	{
		if(s[i]=='7')
		{
			ok = true;
			break;
		}
	}
	if(ok)
	{
		 cout<<"Yes"<<endl;
	}
	else
	{
		 cout<<"No"<<endl;
	}
}