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

#define int         long long
#define pb          push_back
#define pii         pair<int,int>
#define vi          vector<int>
#define vii         vector<pii>
#define mi          map<int,int>
#define mii         map<pii,int>
#define all(a)      (a).begin(),(a).end()
#define sz(x)       (int)x.size()
#define endl        "\n"
#define repp(i,a,b) for(int i=a;i<b;i++)
#define rep(i,a,b) 	for(int i=a;i<=b;i++)
#define IOS         ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

const int N=1e5 + 5;
const int M=1e9 + 7;

string inttos(int num)
{
    return to_string(num);
}

int stoint(string sss)
{
    return stoi(sss);
}

int32_t main()
{
	IOS;
	//memset(dp,-1,sizeof(dp));	
	int T;
	T=1;
	while(T--)
	{
		int n;
		cin >> n;
		int flag=0;
		while(n>0)
		{
			int rem = n%10;
			if(rem==7)
			{
				flag=1;
				break;
			}
			n = n/10;
		}
		if(flag==1)
			cout << "Yes" << endl;
		else
			cout << "No" << endl;
	}
}
