#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;
    string s= to_string(n);
    if(s[0] == '7' || s[1] == '7' || s[2] == '7' )
        cout <<"Yes"<<endl;
    else
        cout<<"No"<<endl;
    return 0;
}
