#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> // Common file  
#include <ext/pb_ds/tree_policy.hpp>
#include <functional> // for less  
using namespace         std;
#define                 int long long
#define                 double long double
#define                 pb push_back
#define                 mp make_pair
#define st(arr,a)       memset(arr,a,sizeof arr)
#define                 nl cout<<'\n'
#define bitcount(x)     __builtin_popcountll(x)
const int MOD = 1000000007ll;
#define forn(i,a,b)     for(int i=a;i<=b;i++)
#define rfor(i,a,b)     for(int i=a;i>=b;i--)
#define all(x)          x.begin() , x.end()
#define pi pair<int,int>
#define X first
#define Y second
#define N 1014159
#define  vi vector<int>
#define  v  vector
#define die exit(0)
#define alln(arr) arr+1 , arr+1+n
using namespace __gnu_pbds;
typedef tree<int, null_type, less<int>, rb_tree_tag,
        tree_order_statistics_node_update> oset;

int n, m, k, arr[N];

void solve()
{
    string s;
    cin >> s;
    bool ok = 0;
    for (auto i : s)if (i == '7')ok = 1;
    if (ok)cout << "Yes";
    else cout << "No";
}


signed main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    int t = 1;
    //cin>>t;
    forn(i, 1, t)
    {
        solve();
        nl;
    }



    return 0;

}

//       clang++ c.cpp ; ./a.out < a.txt ;