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

int main() {
    int n;
    cin >> n;
    if(n/100 == 7 || (n%100)/10 == 7 || n%10 == 7){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
    return 0;
}