#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<n;i++)

int main()
{
    int n;
    cin>>n;
    while(n)
    {
        if(n%10==7)
        {
            cout<<"Yes"<<endl;
            return 0;
        }
        n=n/10;
    }
    cout<<"No"<<endl;
    return 0;
}