// Nguyen Anh Tu
#include <bits/stdc++.h>
#define FOR(x,a,b) for(int x=a;x<=b;x++)
#define FORD(x,a,b) for(int x=a;x>=b;x--)
#define maxn 100005
#define maxc 1000000007
#define MOD 1000000007
#define reset(x, y) memset(x,y,sizeof(x))
#define task ""
#define mp make_pair
#define pb push_back
#define F first
#define S second
#define pii pair<int,int>
#define ll long long
#define bit(p,x) ((x>>p) & 1)
#define remain(a,b) (a+b >= MOD) ? (a+b - MOD) : (a+b)
using namespace std;
string s;
int main()
{
    ios_base::sync_with_stdio(NULL); cin.tie(NULL); cout.tie(NULL);
    if(fopen(task".inp", "r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin >> s;
    for(auto x : s) if(x == '7') return cout << "YES", 0;
    cout << "NO";
    return 0;
}
