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

#define lli long long int
#define REP(i,s,n) for(int i=s;i<n;i++)
#define MOD 1000000007
#define NUM 2520
#define INF (1LL<<50)
#define DEBUG 0
#define mp(a,b) make_pair(a,b)
#define SORT(V) sort(V.begin(),V.end())
#define PI (3.141592653589794)

const string YES = "Yes";
const string NO = "No";

void func(long long N){

    string s = to_string(N);

    if(s[0]=='7' || s[1]=='7' || s[2]=='7')cout<<YES<<endl;
    else cout<<NO<<endl;

}

int main(){
    // cout << fixed << setprecision(5);

    long long N;
    scanf("%lld",&N);
    func(N);
    return 0;
}
