#include<iostream>
#include<cmath>
#include<vector>

using namespace std;

int main(){
  int n;
  cin >> n;
  int a,b,c;
  a=n/100;
  b=n%100-n%10;
  c=n%10;
  if(a==7||b==7||c==7) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}
