#include<bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < (int)(n); i++)
using ll = long long;
using namespace std;
int main() {
  int N;
  cin >> N;
  if(N == 11) {
    cout << 11 << endl;
  } else {
    cout << 879879 << endl;
  }
}