#include <iostream>
#include <string>
#include <string.h>
#include <vector>
using namespace std;
typedef long long ll;


int main(){
    char N[3];

    //input
    cin >> N;

    if(N[0] == '7' || N[1] == '7' || N[2] == '7'){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }

    return 0;
}
