#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
static const int MOD = 1e9+7;

int main(){
    string s;
    cin>>s;
    for(int i=0; i<3; i++){
        if(s[i] == '7'){
            cout<<"Yes"<<endl;
            return 0;
        }
    }

    cout<<"No"<<endl;
    
    return 0;
}