#include<bits/stdc++.h>
using namespace std;
int main(){
		int n;
		cin>>n;
		if(n%10==7){
			cout<<"Yes"<<endl;
		}else {
			n/=10;
			if(n%10==7){
				cout<<"Yes"<<endl;
			}else {
				n/=10;
				if(n==7){
					cout<<"Yes"<<endl;
				}else {
					cout<<"No"<<endl;
				}
			}
			
		}
	return 0;
	
}