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

template<typename T>
struct Z_p{
	using Type = typename decay<decltype(T::value)>::type;
	static vector<Type> mod_inv; 
	constexpr Z_p(): value(){ }
	template<typename U> Z_p(const U &x){ value = normalize(x); }
	template<typename U> static Type normalize(const U &x){
		Type v;
		if(-mod() <= x && x < mod()) v = static_cast<Type>(x);
		else v = static_cast<Type>(x % mod());
		if(v < 0) v += mod();
		return v;
	}
	const Type& operator()() const{ return value; }
	template<typename U> explicit operator U() const{ return static_cast<U>(value); }
	constexpr static Type mod(){ return T::value; }
	Z_p &operator+=(const Z_p &otr){ if((value += otr.value) >= mod()) value -= mod(); return *this; }
	Z_p &operator-=(const Z_p &otr){ if((value -= otr.value) < 0) value += mod(); return *this; }
	template<typename U> Z_p &operator+=(const U &otr){ return *this += Z_p(otr); }
	template<typename U> Z_p &operator-=(const U &otr){ return *this -= Z_p(otr); }
	Z_p &operator++(){ return *this += 1; }
	Z_p &operator--(){ return *this -= 1; }
	Z_p operator++(int){ Z_p result(*this); *this += 1; return result; }
	Z_p operator--(int){ Z_p result(*this); *this -= 1; return result; }
	Z_p operator-() const{ return Z_p(-value); }
	template<typename U = T>
	typename enable_if<is_same<typename Z_p<U>::Type, int>::value, Z_p>::type &operator*=(const Z_p& rhs){
		#ifdef _WIN32
		uint64_t x = static_cast<int64_t>(value) * static_cast<int64_t>(rhs.value);
		uint32_t xh = static_cast<uint32_t>(x >> 32), xl = static_cast<uint32_t>(x), d, m;
		asm(
			"divl %4; \n\t"
			: "=a" (d), "=d" (m)
			: "d" (xh), "a" (xl), "r" (mod())
		);
		value = m;
		#else
		value = normalize(static_cast<int64_t>(value) * static_cast<int64_t>(rhs.value));
		#endif
		return *this;
	}
	template<typename U = T>
	typename enable_if<is_same<typename Z_p<U>::Type, int64_t>::value, Z_p>::type &operator*=(const Z_p &rhs){
		int64_t q = static_cast<int64_t>(static_cast<long double>(value) * rhs.value / mod());
		value = normalize(value * rhs.value - q * mod());
		return *this;
	}
	template<typename U = T>
	typename enable_if<!is_integral<typename Z_p<U>::Type>::value, Z_p>::type &operator*=(const Z_p &rhs){
		value = normalize(value * rhs.value);
		return *this;
	}
	Z_p operator^(long long e) const{
		Z_p b = *this, res = 1;
		if(e < 0) b = 1 / b, e = -e;
		for(; e; b *= b, e >>= 1) if(e & 1) res *= b;
		return res;
	}
	Z_p &operator^=(const long long &e){ return *this = *this ^ e; }
	Z_p &operator/=(const Z_p &otr){
		Type a = otr.value, m = mod(), u = 0, v = 1;
		if(a < int(mod_inv.size())) return *this *= mod_inv[a];
		while(a){
			Type t = m / a;
			m -= t * a; swap(a, m);
			u -= t * v; swap(u, v);
		}
		assert(m == 1);
		return *this *= u;
	}
	template<typename U> friend const Z_p<U> &abs(const Z_p<U> &v){ return v; }
	template<typename U> friend bool operator==(const Z_p<U> &lhs, const Z_p<U> &rhs);
	template<typename U> friend bool operator<(const Z_p<U> &lhs, const Z_p<U> &rhs);
	template<typename U> friend istream &operator>>(istream &in, Z_p<U> &number);
	Type value;
};
template<typename T> bool operator==(const Z_p<T> &lhs, const Z_p<T> &rhs){ return lhs.value == rhs.value; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> bool operator==(const Z_p<T>& lhs, U rhs){ return lhs == Z_p<T>(rhs); }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> bool operator==(U lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) == rhs; }
template<typename T> bool operator!=(const Z_p<T> &lhs, const Z_p<T> &rhs){ return !(lhs == rhs); }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> bool operator!=(const Z_p<T> &lhs, U rhs){ return !(lhs == rhs); }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> bool operator!=(U lhs, const Z_p<T> &rhs){ return !(lhs == rhs); }
template<typename T> bool operator<(const Z_p<T> &lhs, const Z_p<T> &rhs){ return lhs.value < rhs.value; }
template<typename T> Z_p<T> operator+(const Z_p<T> &lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) += rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator+(const Z_p<T> &lhs, U rhs){ return Z_p<T>(lhs) += rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator+(U lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) += rhs; }
template<typename T> Z_p<T> operator-(const Z_p<T> &lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) -= rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator-(const Z_p<T>& lhs, U rhs){ return Z_p<T>(lhs) -= rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator-(U lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) -= rhs; }
template<typename T> Z_p<T> operator*(const Z_p<T> &lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) *= rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator*(const Z_p<T>& lhs, U rhs){ return Z_p<T>(lhs) *= rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator*(U lhs, const Z_p<T> &rhs){ return Z_p<T>(lhs) *= rhs; }
template<typename T> Z_p<T> operator/(const Z_p<T> &lhs, const Z_p<T> &rhs) { return Z_p<T>(lhs) /= rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator/(const Z_p<T>& lhs, U rhs) { return Z_p<T>(lhs) /= rhs; }
template<typename T, typename U, typename enable_if<is_integral<U>::value>::type* = nullptr> Z_p<T> operator/(U lhs, const Z_p<T> &rhs) { return Z_p<T>(lhs) /= rhs; }
template<typename T> istream &operator>>(istream &in, Z_p<T> &number){
	typename common_type<typename Z_p<T>::Type, int64_t>::type x;
	in >> x;
	number.value = Z_p<T>::normalize(x);
	return in;
}
template<typename T> ostream &operator<<(ostream &out, const Z_p<T> &number){ return out << number(); }

/*
using ModType = int;
struct VarMod{ static ModType value; };
ModType VarMod::value;
ModType &mod = VarMod::value;
using Zp = Z_p<VarMod>;
*/

constexpr int mod = (119 << 23) + 1;
using Zp = Z_p<integral_constant<decay<decltype(mod)>::type, mod>>;

template<typename T> vector<typename Z_p<T>::Type> Z_p<T>::mod_inv;
template<typename T = integral_constant<decay<decltype(mod)>::type, mod>>
void precalc_inverse(size_t SZ){
	auto &inv = Z_p<T>::mod_inv;
	if(inv.empty()) inv.assign(2, 1);
	for(; inv.size() <= SZ; ) inv.push_back((mod - 1LL * mod / int(inv.size()) * inv[mod % int(inv.size())] % mod) % mod);
}

// Requires lazy_tag
template<typename L>
struct reverse_segment_tree{
	reverse_segment_tree(): reverse_segment_tree(0){}
	reverse_segment_tree(int n): n(n){
		vector<L> v(n);
		for(int i = 0; i < n; ++ i) v[i] = {i, i + 1};
		*this = reverse_segment_tree(v);
	}
	reverse_segment_tree(const vector<L> &v): n((int)v.size()){
		log = __lg(n + 1) + 1;
		size = 1 << log;
		lazy = vector<L>(size << 1);
		copy(v.begin(), v.end(), lazy.begin() + size);
		for(int i = 1; i < size; ++ i){
			int h = log - __lg(i);
			lazy[i] = {(i << h) - size, (i + 1 << h) - size};
		}
	}
	void update(int ql, int qr, L x){
		if(ql >= qr) return;
		for(int l = ql + size, r = qr + size; l < r; l >>= 1, r >>= 1){
			if(l & 1) lazy[l ++] = x + lazy[l];
			if(r & 1) lazy[r] = x + lazy[-- r];
		}
	}
	L query(int qp){
		L res{qp, qp + 1};
		for(int p = qp + size; p > 0; p >>= 1) res = lazy[p] + res;
		return res;
	}
	void push(){
		for(int i = 1; i < n; ++ i){
			lazy[i << 1] = lazy[i] + lazy[i << 1];
			lazy[i << 1 | 1] = lazy[i] + lazy[i << 1 | 1];
			int h = log - __lg(i);
			lazy[i] = {(i << h) - size, (i + 1 << h) - size};
		}
	}
	int n, size, log;
	vector<L> lazy;
};

struct L{ // Semigroup (Lazy type) / call L(l, r) for initial lazy type for interval [l, r)
	Zp val;
	L(){
	}
	L(Zp val): val(val){
	}
	L(int l, int r): val(0){
	}
	L operator+(const L &x) const{
		return {val + x.val};
	} // Monoid operator, always applies superset to subset
};

int main(){
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(ios::badbit | ios::failbit);
	int n, k;
	cin >> n >> k;
	vector<array<int, 2>> a(k);
	for(auto i = 0; i < k; ++ i){
		for(auto j = 0; j < 2; ++ j){
			cin >> a[i][j];
		}
		++ a[i][1];
	}
	reverse_segment_tree<L> tr(n);
	tr.update(0, 1, {1});
	for(auto i = 0; i < n; ++ i){
		Zp x = tr.query(i).val;
		for(auto [l, r]: a){
			l = min(n, l + i), r = min(n, r + i);
			tr.update(l, r, {x});
		}
	}
	cout << tr.query(n - 1).val << "\n";
	return 0;
}

/*

*/

////////////////////////////////////////////////////////////////////////////////////////
//                                                                                    //
//                                   Coded by Aeren                                   //
//                                                                                    //
////////////////////////////////////////////////////////////////////////////////////////

Measured memory_bytes: 6100