#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
const int inf = 1000000000; 

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