#include <bits/stdc++.h>
#define ll long long
#define oo 1000000010
using namespace std;

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

    string s;
    cin >> s;
    if(s[0] == '7' || s[1] == '7' || s[2] == '7') cout << "Yes";
    else cout << "No";

	return 0;
}
