#include <bits/stdc++.h>
#include <boost/multiprecision/cpp_int.hpp>

using namespace std;
using boost::multiprecision::cpp_int;

typedef long long ll;
typedef pair<ll, ll> pll;

const ll INF = 1e17;
const ll MOD = 1e9+7;

// https://math.nakaken88.com/textbook/cp-binary-exponentiation-and-recursive-function/
ll modPow(long long a, long long n) {
  if (n == 1) return a % MOD;
  if (n % 2 == 1) return (a * modPow(a, n - 1)) % MOD;
  long long t = modPow(a, n / 2);
  return (t * t) % MOD;
}

ll comb(ll n, ll p) {
	if (p * 2 > n) p = n - p;
	if (p > n - p) p = n - p;
	ll a = 1, b = 1;
	for(int i=1; i< p+1; i++) {
		a = (a * (n - i + 1)) % MOD;
		b = (b * i) % MOD;
	}
	return a * (modPow(b, MOD - 2)) % MOD;
}

int main() {
    // input, ready
    string N;
    cin >> N;

    string ans = "No";
    for (auto s : N) {
      if (s=='7') ans="Yes";
    }

    cout << ans << endl;

    return 0;
}
