#include <string>
#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <vector>
#include <cmath>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;

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