#include <bits/stdc++.h>
using namespace std; 
string s;
int main() { 
    //freopen("input.txt","r",stdin);
	//freopen("output.txt","w",stdout);
	cin>>s;
	if(s[0]=='7' || s[1]=='7' || s[2]=='7')cout<<"Yes"<<endl;
	else cout<<"No"<<endl;
    return 0; 
}/*
*/