#include <bits/stdc++.h>

#define REP(i, n) for(int (i)=0;(i)<(n);++(i))
#define REPV(iter, v) for(auto (iter)=(v).begin(); (iter)!=(v).end();++(iter))
#define ALL(v) (v).begin(),(v).end()

#define MOD 1000000007

using namespace std;

typedef long long ll;

int main()
{
    string N;
    cin >> N;
    bool flag = false;
    REP(i, N.size()) if (N[i] == '7') flag = true;
    string ans;
    if (flag) ans = "Yes";
    else ans = "No";

    cout << ans << endl;
}
