#include <bits/stdc++.h>
using namespace std;
#define all(v) (v).begin(), (v).end()
#define lp(i, n) for (int i = 0; i < (n) ; ++i)
#define sz(v) (ll)(v).size()
#define int long long
#define mod 1000000007

void solve() {
        string str; cin>> str;
        if (str[0]== '7'|| str[1]== '7'|| str[2]== '7') cout << "Yes";
        else cout << "No";
}

int32_t main(){
ios::sync_with_stdio(0), cin.tie(NULL), cout.tie(NULL);
        int t = 1;
        //cin >> t;
        while ( t-- ) {
                solve();
        }
return 0;
}
