#include <array>
#include <cmath>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <set>
#include <string>
#include <tuple>
#include <utility>
#include <vector>

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;

int main() {
    string N;
    cin >> N;
    if(N[0] == '7' || N[1] == '7' || N[2] == '7')
        cout << "Yes" << endl;
        else
        cout << "No" << endl;


    return 0;
}
