#SIO2015 #yeahbaby

#include<stdio.h>
unsigned int k[100];
unsigned int st[50];

int main()
{
    unsigned long n = 40;
    char pos = 1;
    scanf("%i", &n);

    for (unsigned long i = 1; i < n; i++)
    {
        scanf("%i %i", &k[2*i + 1], &k[2*i]);
        st[i] = 0;
    }
    unsigned long i;

    for (i = 0; pos != n && i < (2 << n) + 3; i++)
    {
        int t = k[(pos << 1) + st[pos]]; st[pos] ^= 1; pos = t;
    }

    if (pos == n)
    {
        printf("%i", i+1);
    }
    else
    {
        printf("Beskonacno");
    }

    return 0;
}