#define ll long long
#define MOD 1000000007
#define MOD2 998244353
#define mp make_pair
#define pb push_back
#define ff first
#define ss second
#define set2d(array, val, m, n) memset(array, val, sizeof(array[0][0]) * m * n);
#include <bits/stdc++.h>
using namespace std;
ll power(ll x, ll y, ll p)
{
    ll res = 1;
    x %= p;
    while (y > 0)
    {
        if (y & 1)
            res = (res * x) % p;
        y = y >> 1;
        x = (x * x) % p;
    }
    return res;
}
ll po(ll base, ll powerRaised)
{
    if (powerRaised != 0)
        return (base * po(base, powerRaised - 1));
    else
        return 1;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    string s;
    cin >> s;
    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] == '7')
        {
            cout << "Yes";
            return 0;
        }
    }
    cout << "No";
}