import std.stdio, std.conv, std.functional, std.string;
import std.algorithm, std.array, std.container, std.range, std.typecons;
import std.bigint, std.numeric, std.math, std.random;
import core.bitop;

string FMT_F = "%.10f";

static File _f;
void file_io(string fn) { _f = File(fn, "r"); }
static string[] s_rd;
T _RD(T = long)() { while(!s_rd.length) s_rd = readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T _RD(T = long)(File f) { while(!s_rd.length) s_rd = f.readln.chomp.split; string res = s_rd[0]; s_rd.popFront; return res.to!T; }
T[] _RDA(T = long)(T fix = 0) { auto r = readln.chomp.split.to!(T[]); r[] += fix; return r; }
T[] _RDA(T = long)(File f, T fix = 0) { auto r = f.readln.chomp.split.to!(T[]); r[] += fix; return r; }
T RD(T = long)() { if (_f.isOpen) return _RD!T(_f); else return _RD!T; }
T[] RDA(T = long)(T fix = 0) { if (_f.isOpen)  return _RDA!T(_f, fix); else return _RDA!T(fix); }

size_t[] MAKE_IDX(alias less = "a < b", Range)(Range range) { auto idx = new size_t[](range.length); makeIndex!(less)(range, idx); return idx;}
size_t MIN_POS(alias less = "a < b", Range)(Range range) { auto r = minPos!(less)(range); return range.length - r.length; }

void chmin(T)(ref T x, T y) { x = min(x, y); } void chmax(T)(ref T x, T y) { x = max(x, y); }
bool inside(T)(T x, T b, T e) { return x >= b && x < e; }
T lcm(T)(T x, T y) { return x * (y / gcd(x, y)); }

//long mod = 10^^9 + 7;
long mod = 998244353;
//long mod = 1_000_003;
void moda(T)(ref T x, T y) { x = (x + y) % mod; }
void mods(T)(ref T x, T y) { x = ((x + mod) - (y % mod)) % mod; }
void modm(T)(ref T x, T y) { x = (x * y) % mod; }
void modpow(T)(ref T x, T y) { if (!y) { x = 1; return; } auto t = x; x.modpow(y>>1); x.modm(x); if (y&1) x.modm(t); }
void modd(T)(ref T x, T y) { x.modm(y.modpow(mod - 2)); }

struct SegTree(T)
{
	T delegate(const(T), const(T)) f;
	T[] data;
	T init;
    this(T[] _data, T delegate(const(T), const(T)) _f, T _init)
    {
		f = _f; init = _init;
		size_t n = 1; while (n < _data.length) n *= 2; data.length = n*2-1;
		foreach (i; 0.._data.length) data[i+n-1] = _data[i];
		foreach (i; _data.length..n) data[i+n-1] = _init;
		foreach_reverse (i; 0..n-1) data[i] = f(data[i*2+1], data[i*2+2]);
	}
    T query(size_t l, size_t r) const
	{
        size_t n = (data.length+1) / 2; l += n-1; r += n-1; T res = f(init, data[l]);
        while (l < r)
		{
            if ((l & 1) == 0) res = f(res, data[l]);
            if ((r & 1) == 0) res = f(res, data[r-1]);
            l = l/2; r = (r-1)/2;
        }
        return res;
    }
	void update(size_t i, T v)
	{
		i += (data.length+1) / 2 - 1; data[i] = v;
		while (i != 0) { i = (i-1)/2; data[i] = f(data[i*2+1], data[i*2+2]); }
    }
}

T binarySearch(alias pred, T)(T ok, T ng)
{ 
	while (abs(ok-ng) > 1)
	{
		auto mid = (ok+ng)/2;
		if (unaryFun!pred(mid)) ok = mid;
		else ng = mid;
	}
	return ok;
}

void main()
{
	auto N = RD;
	auto XD = new long[][](N);
	foreach (i; 0..N)
	{
		XD[i] = [RD, RD];
	}
	XD.sort!("a[0] < b[0]")();

	auto dummy = new long[](N);
	auto st = new SegTree!long(dummy, (const long a, const long b) => max(a, b), 0);
	auto par = new long[](N);
	foreach_reverse (i; 0..N)
	{
		auto r = XD[i][0] + XD[i][1];
		auto p = binarySearch!((long pos) => XD[pos][0] < r)(i, N);
		if (p == i)
			par[i] = i;
		else
			par[i] = st.query(i+1, p+1);
		st.update(i, par[i]);
	}
	debug writeln(par);

	auto dp = new long[](N+1);
	dp[0] = 1;
	/*long ans = 2;
	ans.modpow(N);
	long last = -1;*/
	foreach (i; 0..N)
	{
		/*if (i <= last) continue;
		long t = 2;
		t.modpow(par[i] - i);
		t.mods(1);*/
		dp[par[i]+1].moda(dp[i]);
		dp[i+1].moda(dp[i]);
		/*ans.mods(t);
		last.chmax(par[i]);*/
	}

	writeln(dp[N]);
	stdout.flush;
	debug readln;
}

Measured memory_bytes: 33020