#include<bits/stdc++.h>
#define mod 1000000007
#define mod1 998244353
#define fast_io ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
typedef long long int li;
typedef unsigned long long int ull;
using namespace std;
bool sortbysec(const pair<li,li>&a,const pair<li,li>&b)
{
    return (a.second<b.second);
}
int main()
{
fast_io
string s;
cin>>s;
if(s[0]=='7'||s[1]=='7'||s[2]=='7')
cout<<"Yes";
else
cout<<"No";
  return 0;
}
