#include<iostream>
#include<iomanip>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<queue>
#include<stack>
#include<algorithm>
#include<vector>
using namespace std;
int main()
{
	string s;
	cin>>s;
	if(s[0]=='7'||s[1]=='7'||s[2]=='7')cout<<"Yes";
	else cout<<"No";
}

