// file creato da gio il 2020-04-12 16:32:10.576145

#include <bits/stdc++.h>
#define FAST 

#ifdef FAST
#pragma GCC optimize("Ofast")
#pragma GCC target("fma,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,tune=native")
#pragma GCC optimize("unroll-loops")
#endif

#define S second
#define F first
#define PB push_back
using namespace std;

int main(){
	//freopen("output","w",stdout);
	//freopen("input","r",stdin);
#ifdef FAST
	ios::sync_with_stdio(0);
  	cin.tie(0);
#endif

	int n;
	cin >> n;
	while(n>0){
		if(n%10==7){
			cout <<"Yes";
			return 0;
		}
		n/=10;
	}
	cout <<"No";
}