#include <bits/stdc++.h>
#define rep(i,n) for (int i=0; i<(n); ++i)
using namespace std;
using ll = long long;

int main()
{
    int n, out, a;
    cin >> n;
    rep(i,3){
        a = n%10;
        if (a==7){
            cout << "Yes" << endl;
            return 0;
        }
        n/=10;
    }
    cout << "No" << endl;
    return 0;
}