
#include<bits/stdc++.h>
#define int long long
#define mod 1e18+10
#define fastio ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
using namespace std;
int32_t main() {
	string s;
	cin>>s;
	if(s[0]=='7' || s[1]=='7' || s[2]=='7')
		cout<<"Yes\n";
	else cout<<"No\n";

}
