#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <string>
using namespace std;
int main(){
	int n;
	if(n/100==7){
		cout<<"Yes"<<endl;
	}else if(n/10%10==7){
		cout<<"Yes"<<endl;
	}else if(n%10==7){
		cout<<"Yes"<<endl;
	}else{
		cout<<"No"<<endl;
	}
	return 0;
}