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#include <bits/stdc++.h>
#include "message.h"
#include "krazki.h"


#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FORD(i, a, b) for(int i = (a); i >= (b); --i)
#define VAR(v, i) __typeof(i) v=(i)
#define FORE(i, c) for(VAR(i, (c).begin()); i != (c).end(); ++i)
#define all(v) (v).begin(),(v).end()
 
#define PII pair<int,int>
#define mp make_pair
#define st first
#define nd second
#define pb push_back
#define lint long long int
#define VI vector<int>
 
#define debug(x) {cerr <<#x <<" = " <<x <<endl; }
#define debug2(x,y) {cerr <<#x <<" = " <<x << ", "<<#y<<" = "<< y <<endl; } 
#define debug3(x,y,z) {cerr <<#x <<" = " <<x << ", "<<#y<<" = "<< y << ", " << #z << " = " << z <<endl; } 
#define debugv(x) {{cerr <<#x <<" = "; FORE(itt, (x)) cerr <<*itt <<", "; cerr <<endl; }}
#define debugt(t,n) {{cerr <<#t <<" = "; FOR(it,0,(n)) cerr <<t[it] <<", "; cerr <<endl; }}
 
#define make( x) int (x); scanf("%d",&(x));
#define make2( x, y) int (x), (y); scanf("%d%d",&(x),&(y));
#define make3(x, y, z) int (x), (y), (z); scanf("%d%d%d",&(x),&(y),&(z));
#define make4(x, y, z, t) int (x), (y), (z), (t); scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define makev(v,n) VI (v); FOR(i,0,(n)) { make(a); (v).pb(a);} 
#define IOS ios_base::sync_with_stdio(0)
#define HEAP priority_queue
 
#define read( x) scanf("%d",&(x));
#define read2( x, y) scanf("%d%d",&(x),&(y));
#define read3(x, y, z) scanf("%d%d%d",&(x),&(y),&(z));
#define read4(x, y, z, t) scanf("%d%d%d%d",&(x),&(y),&(z),&(t));
#define readv(v,n) FOR(i,0,(n)) { make(a); (v).pb(a);}
 
 
using namespace std;

int id;
int nodes;
lint minis[505];
int n, m;
lint moje[4000000];

lint INF = 1e9 * 2LL * 1e9;


int main() {
	id = MyNodeId();
	nodes = NumberOfNodes();
	m = PipeHeight();
	n = NumberOfDiscs();

	int BLOCK_SIZE = (m+nodes-1)/nodes;	
	int B1 = id * BLOCK_SIZE;
	int B2 = min(m, (id+1)*BLOCK_SIZE);
	lint my_min = INF;
	FOR(i,B1, B2) my_min = min(my_min, HoleDiameter(i+1));

	if (id != 0) {
		PutLL(0, my_min);
		Send(0);
	//	cout << " JESTEM " << id << " WYSYLAM " << my_min << " DO " << 0 << endl;
	} else {
		FOR(i,1,nodes) {
			int instancja = Receive(-1);
			lint v = GetLL(instancja);
		//cout << " JESTEM " << 0 << " ODBIERAM " << v << " OD " << instancja << endl;
			minis[instancja] = v;
		}
		minis[0] = my_min;
		FOR(i,1,nodes) {
			FOR(j,0,nodes) PutLL(i, minis[j]);
			Send(i);
		}
	}
	
	if (id != 0) {
		Receive(0);
		FOR(i,0,nodes) minis[i] = GetLL(0);
	}

	int DISKS_BLOCK_SIZE = (n + nodes - 1)/nodes;
	int BD1 = id * DISKS_BLOCK_SIZE;
	int BD2 = min(n, (id+1)*DISKS_BLOCK_SIZE);
	
	lint maxi_disk = 0;
	int id_max = -1;
	FOR(i,BD1, BD2) {
		if (maxi_disk < DiscDiameter(i+1)) id_max = i;
		maxi_disk = max(maxi_disk, DiscDiameter(i+1));
	}
	int zaczepka = 0;
	int znalazl = 0;
	int my_res = m-n+1;
	FOR(j,0,nodes) {
		if (maxi_disk <= minis[j]) {
			zaczepka += BLOCK_SIZE;
		} else {
			znalazl = 1;
			break;
		}
	}
	if (znalazl == 1) {	
		while (HoleDiameter(zaczepka+1) >= maxi_disk) zaczepka++;
		my_res = min(my_res, zaczepka + id_max - n  + 1);
		if (id_max != BD1) {
				moje[0] = HoleDiameter(zaczepka + 1);
				FOR(i,BD1, id_max) {
					moje[i+1-BD1] = moje[i-BD1];
					lint dziura = 0;
					if (zaczepka + (i+1)-BD1 < m) dziura = HoleDiameter(zaczepka+(i+1)-BD1+1);
					moje[i+1-BD1] = min(moje[i+1-BD1], dziura);
				}
				moje[id_max-BD1 + 1] = 0;
				
				int nowa_zaczepka = zaczepka;
				lint my_disk = DiscDiameter(BD1 + 1);
				while (my_disk <= moje[nowa_zaczepka-zaczepka]) nowa_zaczepka++;
				my_res = min(my_res, nowa_zaczepka + BD1 - n + 1);

				FOR(i, BD1 + 1, id_max) {
					my_disk = max(my_disk, DiscDiameter(i + 1));
					nowa_zaczepka--;
					if (nowa_zaczepka < zaczepka) nowa_zaczepka = zaczepka;
					while (nowa_zaczepka >= zaczepka && my_disk > moje[nowa_zaczepka-zaczepka]) nowa_zaczepka--;
					nowa_zaczepka++;
					my_res = min(my_res, nowa_zaczepka + i - n + 1);
				}
		}
	}
//	cout << "JESTEM " << id << " MOJ WYNIK " << my_res << endl;


	if (id != 0) {
		PutInt(0, my_res);
		Send(0);
	} else {
		FOR(i,1,nodes) {
			int instancja = Receive(-1);
			my_res = min(my_res, GetInt(instancja));
		}
		printf("%d\n", max(my_res, 0));
	}
	

}