#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
#define sz(x) int(x.size())
#define pii pair<int,int>
using namespace std;

int main() {
	string s;
	cin>>s;

	if(s[0] == '7' || s[1] == '7' || s[2] == '7') cout<<"Yes\n";
	else cout<<"No\n";
}