#include <iostream>
#include <vector>
#include <queue>
#include <string>
#include <cmath>
#include <cstdlib>

using namespace std;
typedef long long ll;

int main(){
    string s;
    cin >> s;
    for(int i = 0; i < 3; i++){
        if(s[i] == '7'){
            cout << "Yes" << endl;
            return 0;
        }
    }
    cout << "No" << endl;
    return 0;
}
