#include<iostream>
#include<string>
#include <vector>
#include <algorithm>
using ll = long long;
using namespace std;
int main() {
    int n;
    cin >> n;
    
    if (n / 100 == 7 || (n / 10) % 10 == 7 || n % 10 == 7)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;

    return 0;
}
