#include<bits/stdc++.h>
using namespace std;
#define ll long long int 
#define pb push_back
int main()
{
    ll n;
    cin>>n;
    while(n>0)
    {
        if(n%10==7)
        {
            cout<<"Yes";
            return 0;
        }
        n/=10;
    }
    cout<<"No";
    return 0;
}