#include<iostream>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n/100==7){
	    cout<<"Yes";
	    return 0;
    }
    if(n%100/10==7){
    	cout<<"Yes";
    	return 0;
	}
	if(n%10==7){
		cout<<"Yes";
		return 0;
	}
	cout<<"No";
	return 0;
}