#include <cstdio>
#include <vector>
#include <string>
#include <iostream>
#include <algorithm>

using namespace std;
typedef long long ll;

int main() {
    string s; cin >> s;
    for (int i = 0; i < s.size(); i++) {
        if (s[i] == '7') {
            cout << "Yes\n";
            return 0;
        }
    }
    cout << "No\n";
}