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#include <bits/stdc++.h>

#include "message.h"
#include "krazki.h"


#define double long double
#define LL long long
#define MP make_pair
#define ST first
#define ND second
#define PII pair<LL,LL >
#define PPIII pair<PII,int>
#define PPIIPII pair<PII,PII>
#define PIB pair<int,bool>
#define PIS pair<int,string>
#define PB push_back
#define VI vector<LL>
#define VVI vector<VI>
#define VLL vector<long long>
#define VVLL vector<VLL>
#define VB vector<bool>
#define VPII vector<PII>
#define VPPIII vector<PPIII>
#define VPPIIPII vector<PPIIPII>
#define VPIB vector<PIB>
#define VPIS vector<PIS>
#define SI set<int>
#define SPII set<PPIII>
#define VS vector<string>
#define PB push_back
#define INF (LL) 1000000000000000000
#define MOD 2000007
#define ALL(c) c.begin(),c.end()
#define NWD __gcd
#define SIZE 1000000

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);

	if(MyNodeId() != 0)
		return EXIT_SUCCESS;

	LL w=PipeHeight();
	LL zap=NumberOfDiscs();

	vector<LL>szer;


	LL pocz=INF, Id = MyNodeId();

	for(LL i=0;i<w;i++)
	{
		szer.PB(HoleDiameter(i));
		if(i)
			szer[i] =min(szer[i], szer[i-1]);
	}

	LL wys=w-1;
	pocz=0;

	while(true)
	{
		if(pocz == zap)
		{
			cout<<wys<<endl;
			return EXIT_SUCCESS;
		}


		LL kr = DiscDiameter(pocz);
        while(wys >=0 and szer[wys] < kr)
			wys--;

		if(wys==-1)
		{
			cout<<0<<endl;
			return EXIT_SUCCESS;
		}
		wys--;

		pocz++;
	}

	return EXIT_SUCCESS;

}