#include<bits/stdc++.h>
using namespace std;

#define ll long long
#define mx 100005
int n,m;
int ar[mx];
char ch[mx];

int main()
{
    string s;
  cin>>s;
  if(s[0]=='7'|| s[1]=='7'||s[2]=='7')cout<<"Yes\n";
  else cout<<"No\n";
    
}
