#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    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;
}
