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

int main() {
  string s;
  cin >> s;
  if(s[0]=='7'||s[1]=='7'||s[2]=='7'){
    cout << "Yes" << endl;
  }else{
    cout << "No" << endl;
  }
}