#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define ll long long
#define INF 1000000000000000000
#define all(x) x.begin(), x.end()

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