#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;

int main () {
    string n;
    cin >> n;
    REP(i, n.size()) {
        if(n[i] == '7') {
            cout << "Yes" << endl;
            return 0;
        }
    }

    cout << "No" << endl;

}

 
