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

int main(){
  int n;
  cin >> n;
  int a,b,c;
  a = n/100;
  b = (n-a*100)/10;
  c = n%10;
  if(a == 7 or b == 7 or c == 7)
    cout << "Yes" << endl;
  else
    cout << "No" << endl;
}