#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define MIN(a,b) ((a) <= (b) ? (a) : (b))
#define ALL(v) (v).begin(), (v).end()
#define SORT(v) sort( ALL(v) )

using namespace std;
using ll = long long;
using P = pair<int,int>;


int main()
{


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

        if(n%10 == 7)
        {
            cout << "Yes"<<endl;
            return 0;
        }
        n/=10;
    }
    cout <<"No"<<endl;
    return 0;
}
