#include <bits/stdc++.h>

#define rep(i, n) for(int i = 0; i<(n); i++)
#define chmax(x, y) x = max(x, y)
#define chmin(x, y) x = min(x, y)
using namespace std;
using ll = long long;

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