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#include<iostream>
#include<vector>
#include "krazki.h"
#include "message.h"
using namespace std;


int main() {
	ios_base::sync_with_stdio(0);
	if(MyNodeId() == 0) {
		long long n = PipeHeight();
		long long m = NumberOfDiscs();
		vector<long long> A;
		A.push_back(0);
		A.push_back( HoleDiameter(1) );
		for(long long i=2; i<=n; i++) {
			long long a = min(A[i-1], HoleDiameter(i));
			A.push_back(a);
		}
		long long q = n+1;
		long long p = 0;
		for(long long i = 1; i<=m; i++) {
			p = q -1;
			long long diam = DiscDiameter(i);
			while(p > 0 && diam > A[p]) {
				p--;
			}
			q = p;
			if( q == 0) {
				break;
			}		
		}
		cout<<p<<endl;
		return 0;	
	}
	 else return 0;
}