#include <bits/stdc++.h>
using namespace std;

int main() {
  int n;
  cin>>n;
  if (n % 10 == 7) {
    cout<<"Yes"<<endl;
    return 0;
  }
  n /= 10;
  if (n % 10 == 7) {
    cout<<"Yes"<<endl;
    return 0;
  }
  n /= 10;
  if (n % 10 == 7) {
    cout<<"Yes"<<endl;
    return 0;
  }
  cout<<"No"<<endl;

}