#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0 ; i < n ; ++i)
using namespace std;
using ll = long long ;
using P = pair <int,int>;


int main (){
	int a;
	cin >> a ;
	int j = a%100;
	int k = j%10;
	if (k == 7){
		cout << "Yes" << endl;
	}
	else{
		cout << "No" << endl;
	}
	return 0;
}