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

int main(){

    string n; cin >> n;

    if(n[0] == '7' || n[2] == '7' || n[2] == '7') cout << "Yes" << endl;
    else cout << "No" << endl;

    return 0;
}