#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
using namespace std;
using ll = long long;
using P = pair<int,int>;
 
int main(){
    int n;
    cin >> n;
    int f = 0;
    while(n != 0){
        if(n%10 == 7) f = 1;
        n /= 10;
    }
    if(f == 1){
        cout << "Yes" <<endl;
    }else{
        cout << "No" <<endl;
    }
    return 0;
}