/*
sonu_verma1
*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define pb(a) push_back(a)
#define fast() ios_base::sync_with_stdio(false);cin.tie(NULL)
int main()
{
	string s;
	cin>>s;
	if(s[0]=='7'||s[1]=='7'||s[2]=='7')
		cout<<"Yes";
	else
		cout<<"No";


	return 0;
}