#include<bits/stdc++.h>
using namespace std;
int main(){
  string N;
  cin >> N ;
    if (N[0] == '7'){
      cout << "Yes" << endl ;
    }
    else if (N[1] == '7'){
      cout << "Yes" << endl ;
    }
    else if (N[2] == '7'){
      cout << "Yes" << endl ;
    }
    else{
      cout << "No" <<endl;
    }
  }