#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
//cout << fixed << setprecision(17) << res << endl;
 
int main() {
    string s;
    cin >> s;
    if (s[0] == '7' ||s[1] == '7' ||s[2] == '7') {
        cout << "Yes" << endl;
    } else {
        cout << "No" <<endl;
    }
}
