#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep1(i, n) for (int i = 1; i <= (int)(n); i++)
typedef int64_t Int;

int main(){ 
  string S;
  cin >> S;
  
  bool flag = false;
  
  if (S.at(0) == '7') {
    flag = true;
  } else if (S.at(1) == '7') {
    flag = true;
  } else if (S.at(2) == '7') {
    flag = true;
  }
  
  if (flag) cout << "Yes" << endl;
  else cout << "No" << endl;

}