#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;

#define imx INT_MAX
#define imn INT_MIN
#define llmx LLONG_MAX
#define llmn LLONG_MIN

#define fi first
#define se second
#define pb push_back


int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int n, flag=0;
	cin>>n;
	while(n)
	{
		if(n%10==7)
		{
			flag=1;
			break;
		}
		n/=10;
	}
	if(flag) cout<<"Yes"<<endl;
	else cout<<"No"<<endl;
}