#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

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