#include <bits/stdc++.h>
using namespace std;
#define ll          long long
#define vl          vector<ll>
#define vi          vector<int>
#define pi          pair<int,int>
#define pl          pair<ll,ll>
#define all(a)      a.begin(),a.end()
#define mem(a,x)    memset(a,x,sizeof(a))
#define pb          push_back
#define mp          make_pair
#define F           first
#define S           second
#define trace(x)     cerr<<#x<<":"<<x<<endl;
#define trace2(x,y) cerr<<#x<<":"<<x<<"|"<<#y<<":"<<y<<endl;
#define trace3(x,y,z) cerr<<#x<<":"<<x<<"|"<<#y<<":"<<y<<"|"<<#z<<":"<<z<<endl;
#define fast_io     std::ios::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
const int maxn = 1e5+7;
int main(){
	fast_io;
	string s;
	cin>>s;
	if(s[0] =='7' ||s[1]=='7' ||s[2] =='7'){
		cout<<"Yes";
	}else cout<<"No";


	// cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
	return 0;
}