#include "cassert"
#include "testlib.h"

const int min_n = 1, max_n = 100000;
int main(int argc, char* argv[]) {
	registerValidation(argc, argv);
	int n = inf.readInt(min_n, max_n);
	inf.readEoln();
	inf.readInts(n * 2 + 1, 0, 2);
	inf.readEoln();
	inf.readEof();
}