#include<bits/stdc++.h>
#define int long long
#define ld long double
#define pb push_back
#define ff first
#define ss second
#define PI acos(-1)
#define bp __builtin_popcountll
#define all(x) x.begin(),x.end()
#define sp fixed<<setprecision
#define pii pair<long long,long long>
#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
using namespace std;

int MOD = (1e9)+7;
const int N = (1e6)+5;

signed main()
{
    FAST
    int tc=1;
    //cin>>tc;
    for(int ti=1;ti<=tc;ti++)
    {
        string s;
        cin>>s;
        int fl = 0;
        for(int j=0;j<3;j++)if(s[j]=='7')fl=1;
        if(fl)cout<<"Yes";
        else cout<<"No";
    }
    return 0;
}
/*
Test Case
*/
