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#include <cstdlib>
#include <iostream>
#include <stdio.h>
#include <map>
#include <vector>
#include <climits>
using namespace std;
#include "krazki.h"
#include "message.h"
void worker() {
  int pipe_start;
  int pipe_end;
  vector<long long> pipe_mins;
  long long pipe_min = LLONG_MAX;
  int first_empty;
  int p = PipeHeight();
  while(true) {
    Receive(0);
    char operation = GetChar(0);
    if (operation =='a') {
      pipe_start = GetInt(0);
      pipe_end = GetInt(0);
      first_empty = pipe_end;
//      printf("ps %d %d\n", pipe_start, pipe_end);
      for(int i = pipe_start+1; i<= pipe_end ; i++){
        long long diameter = HoleDiameter(i);
        pipe_min = min(pipe_min,diameter);
        pipe_mins.push_back(pipe_min);
      }
      PutLL(0, pipe_min);
      Send(0);
    } else if (operation =='b') {
      int ds_start = GetInt(0);
      int ds_end = GetInt(0);
      long long ds_max = -1;
//      printf("ds %d %d\n", ds_start, ds_end);
      for(int i = ds_start; i< ds_end; i++) {
        long long diameter = DiscDiameter(i);
        ds_max = max(ds_max,diameter);
      }
      PutLL(0, ds_max);
      Send(0);
    } else if (operation =='c') {
      int ds_start = GetInt(0);
      int ds_end = GetInt(0);
//      printf("pipe %d %d %d\n", pipe_start, pipe_end,first_empty);
      for(int i = ds_start; i< ds_end; i++) {
        long long diameter =  DiscDiameter(i);
        
//        printf("disk1 %d %d %d\n",i, diameter, first_empty);
        
        while(first_empty > pipe_start && pipe_mins[first_empty-pipe_start-1] < diameter) {
//          printf("mins %d %d %d\n", first_empty, first_empty-pipe_start,pipe_mins[first_empty-pipe_start-1]);
          first_empty--;
        }
//        printf("mins %d %d %d\n", first_empty, first_empty-pipe_start,pipe_mins[first_empty-pipe_start-1]);
        if(first_empty != pipe_end || pipe_end == p) {
//          printf("dec firstempry\n");
          first_empty--; 
        }
      }
//      printf("first empty %d\n",first_empty);
      PutInt(0, first_empty);
      PutInt(0, pipe_end);
      PutInt(0, first_empty + (ds_end-ds_start));
      Send(0);
//      printf("thread sent c %d\n", MyNodeId());
    } else{
      break;
    }
     
  }
}
struct PipeSection{
  int start;
  int end;
  long long min;
  int task_id;
};


struct DiscSet{
  int start;
  int end;
  long long max;
  int pipe_start;
  int pipe_section_end;
  int pipe_end;
  int task_id;
  int task_id2;
};

void master() {
  int n = NumberOfNodes();
  int p = PipeHeight();
  int d = NumberOfDiscs();
  
  vector<PipeSection> pipe;
  vector<DiscSet> discs;
  int start = 0;
  int task_id = 1;
//  printf("a0");
  while(start < p){
    PipeSection ps;
    ps.start = start;
    if(task_id+1<n){
      ps.end = ps.start + max(p/(n-1),1);
    } else {
      ps.end = p; 
    }
    ps.task_id = task_id;
    pipe.push_back(ps);
    start = ps.end;
    task_id++;
  }
  start = 1;
  task_id = 1;
//  printf("a01");
  while(start <=d){
    DiscSet ds;
    ds.start = start;
    if(task_id+1<n){
      ds.end = ds.start + max(d/(n-1),1);
    } else {
      ds.end = d+1; 
    }
    ds.task_id = task_id;
    start = ds.end;
    discs.push_back(ds);
    task_id++;
  }
//  printf("a1");
  for (const auto& ps : pipe) {
//    printf("node %d\n", ps.task_id);
    PutChar(ps.task_id, 'a');
    PutInt(ps.task_id,ps.start);
    PutInt(ps.task_id,ps.end);
    Send(ps.task_id);
  }
//  printf("a2");
  for (auto& ps : pipe) {
    Receive(ps.task_id);
    ps.min = GetLL(ps.task_id);
//    printf("min %lld\n", ps.min);
  }
//  printf("a3");
  for (const auto& ds : discs) {
    PutChar(ds.task_id, 'b');
    PutInt(ds.task_id,ds.start);
    PutInt(ds.task_id,ds.end);
    Send(ds.task_id);
  }
//  printf("a4");
  for (auto& ds : discs) {
    Receive(ds.task_id);
    ds.max = GetLL(ds.task_id);
//    printf("max %lld\n       ", ds.max);
  }
//  printf("a5");
  int prev = pipe.size()-1;
  for(int i = 0; i<discs.size(); i++){
    int j;
    for(j=0; j<pipe.size(); j++){
      if(j == prev || pipe[j].min<discs[i].max){
        PutChar(pipe[j].task_id, 'c');
        PutInt(pipe[j].task_id,discs[i].start);
        PutInt(pipe[j].task_id,discs[i].end);
        Send(pipe[j].task_id);
        discs[i].task_id = pipe[j].task_id;
        break; 
      }
    }
  }
//  printf("a6");
  for (auto& ds : discs) {
    Receive(ds.task_id);
    ds.pipe_start = GetInt(ds.task_id);
    ds.pipe_section_end = GetInt(ds.task_id);
    ds.pipe_end = GetInt(ds.task_id);
//    printf("discs %d %d %d\n",ds.pipe_start, ds.pipe_section_end,ds.pipe_end);
    ds.task_id2 = -1;
  }
//  printf("a7");
  for(int i = 1; i<discs.size();i++){
    if(discs[i].pipe_end>discs[i].pipe_section_end) {
      if(discs[i-1].pipe_start>discs[i].pipe_section_end){
        discs[i].task_id2 = discs[i-1].task_id;
        PutChar(discs[i].task_id2, 'c');
        PutInt(discs[i].task_id2,discs[i].end - (discs[i].pipe_end-discs[i].pipe_section_end));
        PutInt(discs[i].task_id2,discs[i].end);
        Send(discs[i].task_id2);
//        printf("send to task %d\n", discs[i].task_id2);
        
      }
    }
  }
//  printf("a8");
  for (auto& ds : discs) {
    if(ds.task_id2 != -1){
//      printf("recieve to task %d\n", ds.task_id2);
      Receive(ds.task_id2);
//      printf("a81");
      int pipe_start = GetInt(ds.task_id2);
//      printf("a82");
      int pipe_section_end = GetInt(ds.task_id2);
//      printf("a83");
      int pipe_end = GetInt(ds.task_id2);
//      printf("a84");
      ds.pipe_end = min(ds.pipe_end, pipe_end);
      ds.pipe_start = ds.pipe_end - (ds.end-ds.start);
    }
  }
//  printf("a9");
  for(int i = 1; i<discs.size();i++){
    if(discs[i-1].pipe_start<discs[i].pipe_end) {
      discs[i].pipe_end = discs[i-1].pipe_start;
      discs[i].pipe_start = discs[i].pipe_end-(discs[i].end-discs[i].start);
    }
  }
  
  for(int i = 1; i<n;i++){
    PutChar(i, 'd');
    Send(i);
  }
//  printf("a10\n");
  if(discs[discs.size()-1].pipe_start<0) {
    printf("0\n");
  } else {
    printf("%d\n", discs[discs.size()-1].pipe_start+1);
  }
  
}
int main() {
  if (MyNodeId() != 0) {
    worker();
  } else {
    master();
  }
  return EXIT_SUCCESS;
}