    #include<bits/stdc++.h>
    #include <ext/pb_ds/assoc_container.hpp> 
    #include <ext/pb_ds/tree_policy.hpp> 
    using namespace std;
    using namespace __gnu_pbds; 
    #define lli long long int
    #define fr(i,a,b) for(lli i=a;i<b;i++)
    #define bfr(i,a,b) for(lli i=a;i>=b;i--)
    #define fio ios_base::sync_with_stdio(false); cin.tie(NULL),cout.tie(NULL);
    #define tc int t;cin>>t;while(t--)
    #define mod 1000000007LL
    #define mod2 998244353LL
    #define all(vec) vec.begin(),vec.end()  
    #define ld long double
    #define pb push_back

    #define ordered_set tree<lli, null_type,less<lli>, rb_tree_tag,tree_order_statistics_node_update> 



    int main()
    {
                           
             

               
              fio

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