#include <bits/stdc++.h>
#include <math.h>

using namespace std;

int main(){
    string s;
    cin>>s;
    if(s.at(0)=='7' || s.at(1)=='7' || s.at(2)=='7') cout<<"Yes"<<endl;
    else cout<<"No"<<endl;
    
    return 0;
}