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

#define thegamebegins   ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define fileio          freopen("input.txt", "r", stdin); freopen("output.txt", "w", stdout);
#define int             long long
#define float           long double
#define test            int T; cin>>T; while(T--)
#define in(a,n)         for(int i=0; i<n; ++i)  cin>>a[i]
#define r0              return 0
#define E               "\n"
#define S               " "
#define elif            else if 
#define M               1000000007
#define fi(i,x,y)       for(int i=x; i<y; ++i)
#define fa(i,s)         for(auto i:s)
#define fp(i,s)         for(auto i=(s).begin(); i!=(s).end(); ++i)
#define sz(s)           (int)(s).size()
#define vi              vector <int>
#define vpii            vector <pair <int,int> >
#define mii             map <int,int>
#define pii             pair <int,int>
#define seti            set <int>
#define setd            set <int,greater <int> >
#define all(s)          (s).begin(),(s).end()
#define sortd(a,n)      sort(a, a+n, greater<int>())
#define pb              push_back
#define fr              first
#define sc              second
#define lb              lower_bound
#define ub              upper_bound
#define er              equal_range
 
const int INF = 0x3f3f3f3f;

signed main()
{
    thegamebegins

    string s;   cin>>s;
    if(find(all(s),'7')!=s.end())   cout<<"Yes";
    else    cout<<"No";
    r0;
}
