#include<iostream>
#include<vector>
#include<map>
#include<set>
#include<unordered_map>
#include<unordered_set>
#include<queue>
#include<stack>
#include<algorithm>
#include<string>
using namespace std;

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