#include <bits/stdc++.h>
#define  ll  long long
#define rep(k, n)  for(int i=k; i<n;  i++)
#define rep2(k,n)   for(int j=k; j<n;  j++)
using namespace std;

int main(){
    string s;
    cin >> s;
    rep(0,s.length()){
        if(s[i] == '7'){
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
    return 0;
}