#include <bits/stdc++.h>
using namespace std;

template <typename T>
struct Range {
    T l, r;
    Range(T l, T r) : l(l), r(r) {
        if (l > r) l = r = 0ll;
    }
    Range() : Range(0ll, 0ll) {}
    Range operator&(Range b) const {
        T nl = max(l, b.l), nr = min(r, b.r);
        if (nl < nr) return Range(nl, nr);
        else return Range();
    }
    Range operator|(Range b) const {
        if (max(l, b.l) > min(r, b.r)) return Range();
        return Range(min(l, b.l), max(r, b.r));
    }
    bool empty() const { return l == r; }
    bool contains(T x) const { return l <= x && x < r; }
    T count() const { return r - l; }
    bool operator<(const Range& b) const { return (l != b.l) ? l < b.l : r < b.r; }
};
template <typename T>
struct RangeSet {
    set<Range<T>> ranges;
    RangeSet() {}
    int64_t cnt = 0;

    void insert(Range<T> r) {
        if (r.empty()) return;
        auto it = ranges.lower_bound(r);
        if (it != ranges.end() && it->l == r.l && r.r <= it->r) return;
        if (it != ranges.begin()) {
            auto pit = prev(it);
            if (r.r <= pit->r) return;
            if (r.l <= pit->r) {
                r.l = pit->l;
                cnt -= pit->count();
                ranges.erase(pit);
            }
        }
        while (it != ranges.end() && r.r >= it->l) {
            r.r = max(r.r, it->r);
            cnt -= it->count();
            it = ranges.erase(it);
        }
        cnt += r.count();
        ranges.insert(r);
    }
    void erase(Range<T> r) {
        if (r.empty()) return;
        auto it = ranges.lower_bound(r);
        if (it != ranges.end() && it->l == r.l && r.r <= it->r) {
            Range<T> nl = Range(it->l, r.l);
            Range<T> nr = Range(r.r, it->r);
            cnt -= it->count();
            cnt += nl.count() + nr.count();
            ranges.erase(it);
            if (!nl.empty()) ranges.insert(nl);
            if (!nr.empty()) ranges.insert(nr);
            return;
        }
        if (it != ranges.begin()) {
            auto pit = prev(it);
            if (r.r <= pit->r) {
                Range<T> nl = Range(pit->l, r.l);
                Range<T> nr = Range(r.r, pit->r);
                cnt -= pit->count();
                cnt += nl.count() + nr.count();
                ranges.erase(pit);
                if (!nl.empty()) ranges.insert(nl);
                if (!nr.empty()) ranges.insert(nr);
                return;
            }
            if (r.l <= pit->r) {
                Range<T> nl = Range(pit->l, r.l);
                cnt -= pit->count();
                ranges.erase(pit);
                if (!nl.empty()) ranges.insert(nl);
            }
        }
        while (it != ranges.end() && r.r >= it->l) {
            if (it->r <= r.r) {
                cnt -= it->count();
                it = ranges.erase(it);
            } else {
                Range<T> nr = Range(r.r, it->r);
                cnt -= it->count();
                it = ranges.erase(it);
                if (!nr.empty()) ranges.insert(nr);
            }
        }
    }
    Range<T> get(T x) {
        auto it = ranges.lower_bound(Range<T>(x, numeric_limits<T>::max()));
        if (it != ranges.begin()) {
            auto pit = prev(it);
            if (pit->contains(x)) return *pit;
        }
        return Range<T>();
    }
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    using ll = long long;
    ll d, q;
    cin >> d >> q;

    RangeSet<ll> rs;

    ll ans = 0;
    while (q--) {
        ll a, b;
        cin >> a >> b;
        rs.insert({a, b + 1});
        auto r = rs.get(a);
        ans = max(ans, r.count());
        cout << ans << '\n';
    }
}