#include<iostream>
#include<algorithm>
#include<string>
#include<cstring>
using namespace std;

int i;
char c,c1;
string s;

int main()
{
  getline(cin,s);

  if(s[0]=='0' && s[1]=='7') cout<<"73\n";
  else cout<<"0\n";
    
 return 0;
}