#include <iostream>
#include <stdio.h>
#include <vector>
#include <queue>
#include <stack>
#include <algorithm>
#include <set>
#include <map>
#include <deque>
#include <math.h>
#include <string>
#include <iomanip>
#include <locale>
#include <list>
#include <bitset>
#include <tuple>
using namespace std;
#define FORN(i,m,n) for(int i=(m); i<int(n); i++)
#define PRINTVEC(v) FORN(i,0,v.size()) cout<<v[i]<<" "; cout<<endl
#define PRINTMAT(m) FORN(j,0,m.size()) {PRINTVEC(m[j]);}
typedef long long ll;

int main(){
  ios_base::sync_with_stdio(false); cin.tie(NULL);
  string s; cin>>s;
  bool ok = false;
  FORN(i,0,s.size()) if(s[i] == '7') ok = true;
  cout<<(ok?"Yes":"No")<<endl;
}