#include <bits/stdc++.h>

using namespace std;

int main()
{
	int N;
	cin>>N;
	int a,b,c;
	a=N%10;
	b=(N%100)/10;
	c=N/100;
	if(a==7 || b==7 || c==7)
	{
		cout<<"Yes";
	}
	else
	{
		cout<<"No";
	}
	return 0;
}