#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;
using ll = long long;
int INF = 1000000009;
int main()
{
  int n;
  cin >> n;
  while(n){
    if(n%10==7){
      cout << "Yes" << endl;
      return 0;
    }
    n /= 10;
  }
  cout << "No" << endl;
}