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//Pawel Kura, zadanie Krazki 2

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

#define WORK 'W'
#define FIN 'F'
using namespace std;



/*int pipe_height, number_of_discs;
std::vector<long long int> pipe, discs;

int calls;
static const timespec iv({1, 0});
*/

/*void Init() {
  static bool initialized = false;
  if (!initialized) {
    initialized = true;
    //std::cin >> pipe_height >> number_of_discs;
    pipe_height = 3*1e7 + 4;
    number_of_discs = pipe_height * 3 / 4;

    
    pipe.resize(pipe_height);
    for (int i = 0; i < pipe_height; i++) {
      std::cin >> pipe[i];
    }
    discs.resize(number_of_discs);
    for (int i = 0; i < number_of_discs; i++) {
      std::cin >> discs[i];
    }
  }
}
*/

/*
int PipeHeight() {
  Init();
  return pipe_height;
}

int NumberOfDiscs() {
  Init();
  return number_of_discs;
}

inline void stop() {
    return;
}

long long int HoleDiameter(long long int i) {
  Init();
  //assert(1 <= i && i <= pipe_height);

  calls++;
  if (calls % 2000000 == 0) {
      calls = 0;
      cerr << "stop\n";
      nanosleep(&iv, NULL);
  }
  return 2;
  return pipe[i - 1];
}

long long int DiscDiameter(long long int j) {
  Init();
  //assert(1 <= j && j <= number_of_discs);
  calls++;
  if (calls % 2000000 == 0) {
      calls = 0;
      cerr << "stop\n";
      nanosleep(&iv, NULL);
  }
  return 1;
  return discs[j - 1];
}*/


typedef long long LL;

const LL LINF = 1000000000000000000LL + 1;
/////////////////123456789012345678

int id, p, n, m;
vector<int> from, to;
vector<LL> my_pipe;
LL my_min;

void readshit() {
    id = MyNodeId();
    p = NumberOfNodes();

    n = PipeHeight();
    m = NumberOfDiscs();

    if (n <= 10000000 && m <= 10000000) {
        p = 1;
    }

    p = min(25, p);
    int part_size = (n + p - 1) / p;
    for (int i = 0; i < p; i++) {
        from.push_back(i * part_size);
        to.push_back(min((i + 1) * part_size - 1, n - 1));

        if (from[i] > to[i]) {
            p = i;
            break;
        }
    }
}


bool work() {
    Receive(0);
    char cmd = GetChar(0);
    if (cmd == FIN)
        return false;

    int f = GetLL(0);
    int t = GetLL(0);

    int mf = max(f, from[id]);
    int mt = min(t, to[id]);

    int ok = 1;
    for (int i = mf; i <= mt; i++) {
        int j = i - from[id];
        int k = i - f + 1; //z 1..m
        k = m+1-k;

        int a = DiscDiameter(k); 
        int b = my_pipe[j];
        if (a > b) {
            ok = 0;
            break;
        }
    }


    PutLL(0, ok);
    Send(0);

    return true;
}

bool check(int x) {
    for (int i = 0; i < p; i++) {
        PutChar(i, WORK);
        PutLL(i, x);
        PutLL(i, x + m - 1);
        Send(i);
    }

    work();

    int ok = 1;
    for (int i = 0; i < p; i++) {
        int r = Receive(-1);
        int msg = GetLL(r);

        ok *= msg;
    }

    return ok == 1;
}

void brut() {
    vector<LL> pipe(n);
    vector<LL> disc(m);
    
    for (int i = 0; i < n; i++) {
        pipe[i] = HoleDiameter(i + 1);
    }

    for (int i = 0; i < m; i++) {
        disc[i] = DiscDiameter(i + 1);
    }

    for (int i = 1; i < n; i++) {
        pipe[i] = min(pipe[i], pipe[i-1]);
    }

    int p = n;

    for (int i = 0; i < m; i++) {
        p--;
        while (p >= 0 && disc[i] > pipe[p]) 
            p--;
    }

    cout << max(0, p + 1) << "\n";

}

int main() {
    readshit();

    if (id >= p) {
        return 0;
    }

    if (m > n) {
        if (id == 0) {
            cout << "0\n";
        }
        return 0;
    }
    cerr << "oki\n";
    if (p == 1) {
        brut();
        return 0;
    }

    my_min = LINF;
    for (int i = from[id]; i <= to[id]; i++) {
        my_pipe.push_back(HoleDiameter(i + 1));
        my_min = min(my_min, my_pipe.back());
    }


    LL min_recv = LINF;


    if (id == 0) {
        if (p > 1) {
            PutLL(1, my_min);
            Send(1);
        }
    } else {
        Receive(id - 1);
        min_recv = GetLL(id - 1);
        if (id < p - 1) {
            int min_to_send = min(min_recv, my_min);

            PutLL(id + 1, min_to_send);
            Send(id + 1);
        }
    }

    for (auto i = 0u; i < my_pipe.size(); i++) {
        min_recv = my_pipe[i] = min(my_pipe[i], min_recv);
    }

    if (id == 0) {
        int f = 0;
        int t = n - m + 1;

        while (t - f > 1) {
            int s = (f + t) / 2;

            if (check(s)) {
                f = s;
            } else {
                t = s;
            }
        }

        if (!check(f))
            f--;

        for (int i = 1; i < p; i++) {
            PutChar(i, FIN);
            Send(i);
        }
        cout << f + 1 << "\n";
    } else {
        while (work());
    }
    return 0;
}