#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define INF 1e18

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;
}