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

/*vector<int> p(n);
cin >> p[i]*/

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;
}