#include<bits/stdc++.h>
using namespace std;
int main(){
    freopen("road.in","r",stdin);
    freopen("road.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cout<<13;
    fclose(stdin);
    fclose(stdout);
	return 0;
}


