#include<iostream>
using namespace std;
typedef long long ll;

int main()
{
    int n;
    cin >> n;
    int a,b,c;
    a = n % 10;
    n = n / 10;
    b = n % 10;
    n = n / 10;
    c = n % 10;
    if( a == 7 || b == 7 || c == 7 ){
        cout << "Yes" << endl;
    }
    else{
        cout << "No" << endl;
    }
    return 0;
}

