#include<fstream>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<stack>
#include<vector>
#define MAXN 100000
using namespace std;
class T
{
public:
	long long dis;
	int v;
	int flag;
}
cow[MAXN];
int main()
{
	freopen("cowjoga.in","r",stdin);
	freopen("cowjoga.out","w",stdout);
	int n, m, i, j, k, t, ans;
	cin>>n>>t;
	ans=n;
	for(i=0;i<n;i++)
	{
		cin>>cow[i].dis>>cow[i].v;
		cow[i].flag=0;
	}
	for(i=1;i<=t;i++)
	{
		for(j=0;j<n;j++)
		{
			cow[j].dis=cow[j].dis+cow[j].v;
		}
		for(j=0;j<n-1;j++)
		{
			if(cow[j].dis>=cow[j+1].dis && cow[j].flag==0)
			{
				cow[j].dis=cow[j+1].dis;
				cow[j].v=cow[j+1].v;
				cow[j].flag=j+1;
				ans--;
			}
		}
		
	}
	cout<<ans<<endl;
	return 0;
}