#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <ctime>
#include <cctype>
#include <algorithm>
#include <cmath>
using namespace std;
//#define USEFREAD
#ifdef USEFREAD
#define InputLen 5000000
char *ptr=(char *)malloc(InputLen);
#define getc() (*(ptr++))
#else
#define getc() (getchar())
#endif
#define SetFile(x) (freopen(#x".in", "r", stdin), freopen(#x".out", "w", stdout))
template<class T>inline void getd(T &x){
	int ch = getc();bool neg = false;
	while(!isdigit(ch) && ch != '-')ch = getc();
	if(ch == '-')ch = getc(), neg = true;
	x = ch - '0';
	while(isdigit(ch = getc()))
		x = x * 10 - '0' + ch;
	if(neg)x = -x;
}
/***********************************************************************/
typedef long long LL;
const int maxn = 100005;
int N, Begin[maxn];
LL T, End[maxn];

int main(){
	#ifdef DEBUG
	freopen("test.txt", "r", stdin);
	#else       
	SetFile(cowjoga);
	#endif
	#ifdef USEFREAD
	fread(ptr,1,InputLen,stdin);
	#endif
	
	getd(N), getd(T);;
	int i, ans = N, v;
	LL Min = 0x7fffffffffffffffll;
	for(i = 1;i <= N;++i){
		getd(Begin[i]), getd(v);
		End[i] = T * v + Begin[i];
	}
	for(i = N;i;--i){
		if(Min <= End[i])--ans;
		else Min = End[i];
	}
	printf("%d\n", ans);
	
	
#ifdef DEBUG
    printf("\n%.3lf sec \n", (double)clock() / CLOCKS_PER_SEC);
#endif
    return 0;
}