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

int main(){

	ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    string s;
    cin >> s;
    if(s[0]=='7' || s[1] == '7' || s[2] == '7'){
    	cout << "Yes\n";
    }
    else{
    	cout << "No\n";
    }

	return 0;
}