#include <bits/stdc++.h>
#define rep(i, n) for (int i=0; i<(n); ++i)
#define repr(i, a, b) for (int i=a; i<(b); ++i)
#define reprev(i, n) for (int i=n-1; i>=0; --i)
#define reprrev(i, a, b) for (int i=b-1; i>=(a); --i)
using namespace std;
using ll = long long;
using P = pair<int, int>;

int main() {
    cout << fixed << setprecision(10);
    
    int N; cin >> N;
    rep(i, 3) {
        if (N % 10 == 7) {
            cout << "Yes" << endl;
            return 0;
        }
        N /= 10;
    }
    cout << "No" << endl;
    return 0;
}