#include <stdio.h>

#define nm 1010

int n, i, sol;
int v[nm];

void read()

{
	scanf("%d", &n);

    for (i=1; i<=2*n-1; i++)
    {
    	scanf("%d", &v[i]);
    }
}


void solve()

{
	sol = 0;
}


void write()

{
	printf("%d\n", sol);
}


int main()

{
	freopen("culori.in", "r", stdin);
    freopen("culori.out","w",stdout);

    read();
    solve();
    write();

    fclose(stdin);
    fclose(stdout);

	return 0;
}