#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>;

const int INF = 1001001001;

int main() {
  string n;
  cin >> n;

  if(n[0] == '7' || n[1] == '7' ||n[2] == '7') cout<<"Yes"<<endl;
  else cout<<"No"<<endl;
    return 0;
}