#include <bits/stdc++.h>
#include <math.h>
using namespace std;

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

}