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

#define INF 1000000000000


int main(){

  string n;cin>>n;
  if(n[0]=='7' || n[1]=='7' || n[2]=='7'){cout<<"Yes";}
  else cout<<"No";

}
