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#include <stdio.h>
#include <stdlib.h>
int globina (int * t) {
fprintf(stderr, "-> %d %d\n", t[0], t[1]);
if (!t[0] && !t[1])
return 0;
int r = 0;
if (t[0])
r = globina(t+2*t[0]);
if (t[1]) {
int g = globina(t+2*t[1]);
if (g > r)
r = g;
}
return r+1;
}
int main (void) {
int n;
scanf("%d\n", &n);
int t[2*n];
for (int i = 0; i < 2*n; i++)
scanf("%d", &t[i]);
printf("%d\n", globina(t));
}
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