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

#define rep(i, n) for(int i = 0; i < n;i++)

int main()
{
    string N;
    cin >> N;
    if(N[0] == '7' || N[1] == '7' || N[2] == '7'){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
}