#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(){
    int s ;
    cin >> s;
    if (s /  100 == 7 ) cout << "Yes" << endl;
    else if ((s%100)/10 == 7) cout << "Yes" << endl;
    else if (((s%100)%10)/1 == 7) cout << "Yes" << endl;
    else cout << "No" << endl;
    return 0;
}