#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
//using P = pair<int,int>;
//pow(x,n)
//cout << fixed << setprecision(桁数);

int main() {
    int n;
    cin >> n;

    int a= n/100;
    int b=(n/10)%10;
    int c=(n%10);
    if(a==7 || b==7 || c==7) cout << "Yes" << endl;
    else cout << "No" << endl;
}