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

int main(){
    string n; cin >> n;

    for(int i = 0; i < n.length(); i++){
        if(n[i] == '7'){ 
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
    return 0;
}