#define pb push_back
#define ff first
#define ss second
#define ll long long
#define maxn 100005
#define mod 1000000007
#include <bits/stdc++.h>
using namespace std;



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

    return 0;
}
