#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0;i<=(int)(n);++i)
#define REP(i,n_1,n_2) for(int i=(int)(n_1);i<=(int)(n_2);++i)
#define ll long long
#define P pair<int,int>

int main(){
    string s;
    cin>>s;
    if(s.at(0)=='7'||s.at(1)=='7'||s.at(2)=='7')
        cout<<"Yes"<<endl;
    else
        cout<<"No"<<endl;
    return 0;
}