#include <cstdio>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <cmath>
#include <queue>

using namespace std;

typedef long long ll;

int main(){
  string s;
  cin >> s;
  for(int i = 0; i < 3; i++) {
    if (s[i] == '7') {
      cout << "Yes" << endl;
      return 0;
    }
  }
  cout << "No" << endl;

  return 0;
}