#include<bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(),(x).end()
const long long mod = 1e9+7;
const int dx[4] = {0,1,0,-1};
const int dy[4] = {1,0,-1,0};
const int ddx[4] = {1,1,-1, -1};
const int ddy[4] = {1,-1,-1,1};
//////////////////////////////////

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

  return 0;
}

// EOF
