#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 s; cin >> s;
  bool f = false;
  rep(i, 3)
    if (s[i] == '7') f = true;
  puts(f ? "Yes" : "No");
  return 0;
}