#include <iostream>
#include <algorithm>
#include <map>
#include <vector>
#include <cmath>
using namespace std;
int main(){
    string s;
    cin >> s;
    if (s[0]=='7' || s[1]=='7' || s[2]=='7')
    	cout << "YES";
    else cout << "NO";
        return 0;
}