// Binarisfa2.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <deque>
#include <cmath>

using namespace std;

struct adat {
    int ertek, hossz=1;
    deque<int>bin;
};
deque<int>binaris;
deque<adat>x;
int a, b,maxi,db,n,m;
void atalakit(int a)
{
    while (a > 0)
    {
        x[b].bin.push_back(a % 2);
        a = a / 2;
    }
}

void melysegi(int csp)
{
    //db += x[csp].hossz;
    /*if (binaris.back() == 0 && binaris.size()>1)
    {
        binaris.pop_back();
        melysegi(csp / 2);
    }
    else if (binaris.back() == 1&&binaris.size()>1)
    {
        binaris.pop_back();
        melysegi((csp - 1) / 2);
    }*/
    a = csp;
    for (auto& e : x[csp].bin)
    {
        if (e == 1)
        {
            
            db += x[a].hossz;
            a = (a - 1) / 2;
        }
        else if (e == 0)
        {
            
            db += x[a].hossz;
            a = a / 2;
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m;
    x.resize(pow(2, n));   
    for (int j = pow(2, n - 1); j <= pow(2, n) - 1; ++j)
    {
        b = j;
        atalakit(j);
    }

    for (int i = 1; i <= m; ++i)
    {
        cin >> a >> b;
        x[a].hossz = b;
        maxi = 0;
        for (int j = pow(2, n - 1); j <= pow(2, n) - 1; ++j)
        {
            db= -1;
            melysegi(j);
            if (maxi < db) maxi = db;
        }

        cout << maxi << "\n";
    }
    return 0;
}
/*
3 5
2 6
4 3
6 7
5 4
2 1
*/
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

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