#include <bits/stdc++.h>
#define ll long long int
#define MOD 1000000007
#define INF 1e18

using namespace std;

int main(void){
  ll n;
  cin >> n;
  
  if (n % 10 == 7 || (n/10) % 10 == 7 || (n / 100) % 10 == 7)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
    

  return 0;
}
