#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (n); i++)
using namespace std;
using ll = long long;

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