#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(){
  string a,b;
  b = "No";
  cin >> a;
  rep(i,3){
    if(a[i]=="7")
      b = "Yes";
  }
  cout << b << endl;    
}
