#include <iostream>

using ll = long long;
using ull = unsigned long long;

using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    string s;
    cin>>s;

    if(s[0] == '7' or s[1] == '7' or s[2] == '7')
        cout<<"Yes\n";
    else
        cout<<"No\n";

    return 0;
}
