#include <iostream>
using namespace std;
#define LL long long
#include <string>

int main()
{
    char n[10];
    cin >> n;
    for (int i = 0; i < 3; ++i) {
        if (n[i] == '7') {
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;

    return 0;
}

