#include <bits/stdc++.h>
#define ll long long
#define pq priority_queue
using namespace std;
const ll INF=(ll)1e9;
const ll MOD=(ll)1e9+7;
const ll MAX=510000;
vector<int> dx={1,0,-1,0},dy={0,1,0,-1};
template<class T> inline bool chmax(T& a, T b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a>b) { a=b; return 1; } return 0; }

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