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

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