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


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;
}

