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#define _CRT_SECURE_NO_WARNINGS 1
#define _WINSOCK_DEPRECATED_NO_WARNINGS 1
//
#include <cstdio>
#include "message.h"
#include "teatr.h"

using namespace std;

const int MAX = 1000001;
int level[MAX];

int main()
{
	int node = MyNodeId();

	if (node > 20)
	{
		return 0;
	}
	if (node == 0)
	{
		long long sum = 0;

		for (int i = 0; i < 20; ++i)
		{
			int from = Receive(-1);
			sum += GetLL(from);
		}

		printf("%llu", sum);
		return 0;
	}

	int n = GetN();
	long long result = 0;	

	while (--n > -1)
	{
		int height = GetElement(n);
		int bucket = height >> (node - 1);

		if (bucket & 1)
		{
			result += level[bucket - 1];
		}

		level[bucket]++;
	}

	PutLL(0, result);
	Send(0);
}