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#include <vector>
#include <iostream>
#include "krazki.h"
#include "message.h"
#define ull unsigned long long
using namespace std;
ull n,m,x,d,zero=0;
int main()
{
    if(MyNodeId()==0){
        n=PipeHeight();
        m=NumberOfDiscs();
        vector<ull> w(n, 0);
        w[0]=HoleDiameter(0);
        for (int i = 1; i < n; i++) {
            w[i]=HoleDiameter(i);
            w[i] = min(w[i], w[i-1]);
        }
        d=n;
        for (int i = 1; i <= m; i++) {
            x=DiscDiameter(i);
            while (d>0 && w[d-1]<x) d--;
            d--;
        }
        cout<<max(zero,d+1);
    }
  return 0;
}