#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>;

int main(){
    int n;
    cin >> n;
    bool flag = false;
    if(n%10==7) flag=true;
    n = n/10;
    if(n%10==7) flag = true;
    n = n/10;
    if(n%10==7) flag = true;

    if(flag) cout << "Yes" << endl;
    else cout << "No" << endl;
}
