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

int main() {
  int n;
  ll p;

  cin >> n;

  if ((n/100==7)||((n%100)/10==7)||(n%10==7))  cout << "Yes" << endl;
  else cout << "No" <<endl;
  return 0;
  
  }