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

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