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

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