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