#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <array>
#include <cctype>
#include <cstring>
#include <cstdlib>
#include <cassert>
#include <cmath>
#include <ctime>
#include <iomanip>
#include <numeric>
#include <stack>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
#include <unordered_set>
#include <bitset>
#include <random>
#include <utility>
#include <functional>
using namespace std;
template<class T,T (*op)(T,T),T e(),class F,T (*mapping)(F,T),F (*composition)(F,F),F id()> struct LazySegmentTree
{
    private:
    vector<T> node;
    vector<F> lazy;
    int siz,log;

    void map_and_comp(F f,int u)
    {
        node[u] = mapping(f,node[u]);
        if(u < siz) lazy[u] = composition(f,lazy[u]);
    }

    void propagate(int u)
    {
        assert(0 <= u && u < siz);

        map_and_comp(lazy[u],2*u);
        map_and_comp(lazy[u],2*u+1);

        lazy[u] = id();
    }

    void recalculate(int u) {node[u] = op(node[2*u],node[2*u+1]);}

    public:
    LazySegmentTree(int n = 0) : LazySegmentTree(vector<T>(n,e())) {}
    LazySegmentTree(const vector<T> &V)
    {
	    siz = 1;
	    log = 0;
	    while(siz < (int)V.size()) siz <<= 1,log++;
	    node.assign(2*siz,e());
	    lazy.assign(siz,id());
	    for(int i = 0;i < (int)V.size();i++) node[i+siz] = V[i];
	    for(int i = siz-1;i >= 1;i--) recalculate(i);
    }

    void fill(T x,int l = 0,int r = -1) {if(r < 0){r = siz;} for(int i = l;i < r;i++) replace(i,x);}

    void clear() {fill(e());}

    void replace(int pos,T x) {func_update(pos,x,[](T u,T v){return u = v;});}

    void add(int pos,T x) {func_update(pos,x,[](T u,T v){return u + v;});}

    void func_update(int pos,T x,T (*func)(T,T))
    {
        assert(0 <= pos && pos < siz);
        pos += siz;

        for(int i = log;i >= 1;i--) propagate(pos >> i);

        node[pos] = func(node[pos],x);

        for(int i = 1;i <= log;i++) recalculate(pos >> i);
    }

    T operator[](int pos)
    {
        assert(0 <= pos && pos < siz);

        pos += siz;
        for(int i = log;i >= 1;i--) propagate(pos >> i);
        return node[pos];
    }

    void apply(int pos,F f)
    {
        assert(0 <= pos && pos < siz);
        pos += siz;

        for(int i = log;i >= 1;i--) propagate(pos >> i);

        node[pos] = mapping(f,node[pos]);

        for(int i = 1;i <= log;i++) recalculate(pos >> i);
    }

    void apply(int l,int r,F f)
    {
        assert(0 <= l && l <= r && r <= siz);
        if(l == r) return;

        l += siz;
        r += siz;

        int l0 = l/(l & -l);
        int r0 = r/(r & -r);

        for(int i = log;i >= 1;i--) propagate(l0 >> i);
        for(int i = log;i >= 1;i--) propagate((r0-1) >> i);

        while(l < r)
        {
            if(l & 1) map_and_comp(f,l++);
            if(r & 1) map_and_comp(f,--r);

            l >>= 1;
            r >>= 1;
        }

        for(int i = 1;i <= log;i++) recalculate(l0 >> i);
        for(int i = 1;i <= log;i++) recalculate((r0-1) >> i);
    }

    T prod() {return node[1];}

    T prod(int l,int r)
    {
        assert(0 <= l && l <= r && r <= siz);

        l += siz;
        r += siz;

        int l0 = l/(l & -l);
        int r0 = r/(r & -r);

        for(int i = log;i >= 1;i--) propagate(l0 >> i);
        for(int i = log;i >= 1;i--) propagate((r0-1) >> i);

        T Lval = e(),Rval = e();
        while(l < r)
        {
            if(l & 1) Lval = op(Lval,node[l++]);
            if(r & 1) Rval = op(node[--r],Rval);

            l >>= 1;
            r >>= 1;
        }

        return op(Lval,Rval);
    }
};
struct S
{
	long long l,r,size,mx;
};
S op(S a,S b)
{
	S x;
	x.l = a.l;
	if(a.l == a.size) x.l += b.l;
	x.r = b.r;
	if(b.r == b.size) x.r += a.r;
	x.mx = max(a.mx,b.mx);
	x.mx = max(x.mx,a.r + b.l);
	x.size = a.size + b.size;
	return x;
}
S e()
{
	return S{0,0,0,0};
}
S mp(int f,S x)
{
	if(f)
	{
		x.l = x.size;
		x.r = x.size;
		x.mx = x.size;
	}
	return x;
}
int cp(int f,int g)
{
	return f|g;
}
int id()
{
	return 0;
}
void solve()
{
	long long D;
	int Q;
	cin >> D >> Q;
	vector<long long> comp;
	vector<long long> A(Q),B(Q);
	for(int i = 0;i < Q;i++)
	{
		cin >> A[i] >> B[i];
		comp.push_back(A[i]);
		comp.push_back(++B[i]);
	}
	sort(comp.begin(),comp.end());
	comp.erase(unique(comp.begin(),comp.end()),comp.end());
	vector<S> init(comp.size() - 1);
	for(int i = 0;i + 1 < (int)comp.size();i++)
	{
		init[i].size = comp[i+1] - comp[i];
	}
	LazySegmentTree<S,op,e,int,mp,cp,id> seg(init);
	for(int i = 0;i < Q;i++)
	{
		int l = lower_bound(comp.begin(),comp.end(),A[i]) - comp.begin();
		int r = lower_bound(comp.begin(),comp.end(),B[i]) - comp.begin();
		seg.apply(l,r,1);
		cout << seg.prod().mx << "\n";
	}
}
int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int tt = 1;
	/* cin >> tt; */
	while(tt--) solve();
}