#include<iostream>
#include<algorithm>
#include<math.h>
#include<cstring>
#include<vector>

using namespace std;

#define long long long
#define ft(i, a, b) for (int i = (long)a ; i <= (long)b ; i++)
#define fd(i, a, b) for (int i = (long)a ; i >= (long)b ; i--)

const int MAXN = 1e5 + 5;
const long oo = 1e15;

string s;

void Solve() {
    if (s[0] == '7' || s[1] == '7' || s[2] == '7') cout << "YES";
    else cout << "NO";
}

void FastInput() {
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(".inp", "r", stdin);
    //freopen(".out", "w", stdout);
}

void Input() {
    cin >> s;
}

int main() {
    FastInput();
    Input();
    Solve();
}