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#include <stdio.h>
#include <vector>
#include <algorithm>
#include "krazki.h"
#include "message.h"
using namespace std;
const int N = 2000010, X = 110;
const long long M = 1000000000000000010;
struct part
{
	int l, r, target;
};
bool sended[X];
int n, m, nn, mn;
long long pipe[N], disc[N], NodeMin[X];
vector <part> Parts, ToMerge, Merged;
void PipesEq()
{
	pipe[0] = M;
	for (int i = 1; i <= nn; ++i)
		pipe[i] = min(pipe[i - 1], HoleDiameter(n * MyNodeId() + i));
	long long prev;
	if (MyNodeId() > 0)
	{
		Receive(MyNodeId() - 1);
		prev = GetLL(MyNodeId() - 1);
	}
	if (MyNodeId() != NumberOfNodes() - 1)
	{
		PutLL(MyNodeId() + 1, min(prev, pipe[nn]));
		Send(MyNodeId() + 1);
	}
	for (int i = 1; i <= nn; ++i)
		pipe[i] = min(pipe[i], prev);
}
void DiscsEq()
{
	disc[mn + 1] = 0;
	for (int i = mn; i > 0; --i)
		disc[i] = max(disc[i + 1], DiscDiameter(m * MyNodeId() + i));
	long long prev;
	if (MyNodeId() != NumberOfNodes() - 1)
	{
		Receive(MyNodeId() + 1);
		prev = GetLL(MyNodeId() + 1);
	}
	if (MyNodeId() > 0)
	{
		PutLL(MyNodeId() - 1, max(prev, disc[1]));
		Send(MyNodeId() - 1);
	}
	for (int i = 1; i <= mn; ++i)
		disc[i] = max(disc[i], prev);
}
void MakeNodeMin()
{
	for (int i = 0; i < NumberOfNodes(); ++i)
	{
		PutLL(i, pipe[nn]);
		Send(i);
	}
	for (int i = 0; i < NumberOfNodes(); ++i)
	{
		Receive(i);
		NodeMin[i] = GetLL(i);
	}
}
void MakeParts()
{
	int l, r, prev = -1;
	for (int i = 1; i <= mn; ++i)
	{
		int a = 0, b = NumberOfNodes(), c;
		while (a < b)
		{
			c = (a + b) / 2;
			if (NodeMin[c] >= disc[i])
				a = c + 1;
			else
				b = c;
		}
		if (prev == a)
			++r;
		else
		{
			if (prev != -1)
			{
				part temp;
				temp.l = l, temp.r = r, temp.target = prev;
				Parts.push_back(temp);
			}
			l = m * MyNodeId() + i, r = m * MyNodeId() + i, prev = a;
		}
	}
	part temp;
	temp.l = l, temp.r = r, temp.target = prev;
	Parts.push_back(temp);
}
void SendParts()
{
	PutInt(0, (int)Parts.size());
	for (int i = 0; i < Parts.size(); ++i)
	{
		PutInt(0, Parts[i].l);
		PutInt(0, Parts[i].r);
		PutInt(0, Parts[i].target);
	}
	Send(0);
}
void MergeParts()
{
	for (int i = 0; i < NumberOfNodes(); ++i)
	{
		Receive(i);
		int Num = GetInt(i);
		for (int j = 0; j < Num; ++j)
		{
			part temp;
			temp.l = GetInt(i), temp.r = GetInt(i), temp.target = GetInt(i);
			ToMerge.push_back(temp);
		}
	}
	int prev = -1;
	for (int i = 0; i < ToMerge.size(); ++i)
	{
		if (ToMerge[i].target != prev)
		{
			Merged.push_back(ToMerge[i]);
			prev = ToMerge[i].target;
		}
		else
			Merged.back().r = ToMerge[i].r;
	}
	for (int i = 0; i = Merged.size(); ++i)
	{
		Merged[i].l = max(Merged[i].l, Merged[i].r - n);
	}
}
void SendMergedParts()
{
	for (int i = 0; i = Merged.size(); ++i)
	{
		PutInt(Merged[i].target, Merged[i].l);
		PutInt(Merged[i].target, Merged[i].r);
		Send(Merged[i].target);
		sended[Merged[i].target] = true;
	}
	for (int i = 0; i < NumberOfNodes(); ++i)
		if (!sended[i])
		{
			PutInt(i, -1);
			PutInt(i, -1);
			Send(i);
		}
}
void ReceiveMergedParts()
{
	Receive(0);
	int mini = 2000000010;
	int l = GetInt(0), r = GetInt(0);
	if (l != -1)
	{
		for (int i = l; i <= r; ++i)
		{
			long long d = DiscDiameter(i);
			int a = 1, b = nn, c;
			while (a < b)
			{
				c = (a + b) / 2;
				if (pipe[c] >= disc[i])
					a = c + 1;
				else
					b = c;
			}
			mini = min(mini, n * MyNodeId() + a - i);
		}
		PutInt(0, mini);
		Send(0);
	}
	else
	{
		PutInt(0, 2000000010);
		Send(0);
	}
}
void Result()
{
	int mini = 2000000010;
	for (int i = 0; i < NumberOfNodes(); ++i)
	{
		Receive(i);
		mini = min(mini, GetInt(i));
	}
	printf("%d", mini);
}
int main()
{
	int n = ceil((double)PipeHeight() / (double)NumberOfNodes()), m = ceil((double)NumberOfDiscs() / (double)NumberOfNodes());
	int nn = min(n, PipeHeight() - n * MyNodeId()), mn = min(m, NumberOfDiscs() - m * MyNodeId());
	PipesEq();
	DiscsEq();
	MakeNodeMin();
	MakeParts();
	SendParts();
	if (MyNodeId() == 0)
		MergeParts();
	if (MyNodeId() == 0)
		SendMergedParts();
	ReceiveMergedParts();
	if (MyNodeId() == 0)
		Result();
	return 0;
}