#include <iostream>
#include <vector>
#include <algorithm>
#define ll long long
using namespace std;
int main(){
    string n;
    cin>>n;
    
    for(int i=0;i<n.length();i++){
        if('7'==n[i]){
            cout<<"Yes";
            return 0;
        }
    }
    cout<<"No";
    return 0;
}