#include<bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
    string s;
    cin >> s;
    if(s[0] == '7' || s[1] == '7' || s[2] == '7' )
    {
        cout << "Yes" << endl;

    }
    else  
    cout << "No" << endl;
}