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


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