#include <iostream>
#include <stack>
#include <math.h>
#include <vector>
#include <algorithm>

#define rep(i,n) for(int i=0; i < n; i++)
using namespace std;

int main()
{
    int n;
    cin >> n;
    
    while (n)
    {
        if (n % 10 == 7)
        {
            cout << "Yes" << endl;
            return 0;
        }
        n /= 10;
    }
    cout << "No" << endl;
    return 0;
}