#include <bits/stdc++.h>

using namespace std;

int main(){
	string s;
	cin >> s;
	bool ok = false;
	for(int i=0;i<s.size();++i){
		if(s[i] == '7') ok = true;
	}

	cout << (ok ? "Yes" : "No") << '\n';
	return 0;
}