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