#include<cstdio>
#include<cstdlib>
#include<iostream>
using namespace std;
struct pos
{
	long long q;
	long long z;
}f[200000];
int main()
{
	freopen("cowjoga.in","r",stdin);
	freopen("cowjoga.out","w",stdout);
	int n;
	long long t;
	scanf("%d%lld",&n,&t);
	long long maxh=0;
	int ans=0;
	long long v;
	for(int i=1;i<=n;++i)
	{
		scanf("%lld%lld",&f[i].q,&v);
		f[i].z=(long long)(f[i].q+v*t);
		if(f[i].z>maxh)
		{
			++ans;
		}
		maxh=f[i].z;
	}
	
	printf("%d\n",ans);
	return 0;
	
	
}