#include <stdio.h>
#include <assert.h>

#define MAXN 100000

int main() {
    int N;
    int X[MAXN];
    int Y[MAXN];

    assert(1 == scanf("%d", &N));
    for (int i=0; i<N-1; i++)
        assert(2 == scanf("%d %d", &X[i], &Y[i]));

    // insert your code here
    printf("%d", 42);
    
    return 0;
}