#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    int a,b,c;
    a = n/100;
    b = n/10%10;
    c = n%10;
    //cout << a << b << c << endl;
    if( a==7 || b==7 || c==7){
        cout << "Yes" << endl;
    }else{
        cout << "No" << endl;
    }
    return 0;
}


