//sub-BOF
//#define _AOJ_
#define _C_INPUT_

#pragma region template

#pragma region basic
//#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#define NOMINMAX
#include "bits/stdc++.h"
using namespace std;
typedef int64_t lint;
typedef long double ld;
typedef string cs;
#define linf 1152921504606846976
#pragma endregion

#pragma region rep
#define _vcppunko4(tuple) _getname4 tuple
#define _getname4(_1,_2,_3,_4,name,...) name
#define _getname3(_1,_2,_3,name,...) name
#define _trep2(tuple) _rep2 tuple
#define _trep3(tuple) _rep3 tuple
#define _trep4(tuple) _rep4 tuple
#define _rep1(n) for(lint i=0;i<n;++i)
#define _rep2(i,n) for(lint i=0;i<n;++i)
#define _rep3(i,a,b) for(lint i=a;i<b;++i)
#define _rep4(i,a,b,c) for(lint i=a;i<b;i+=c)
#define _trrep2(tuple) _rrep2 tuple
#define _trrep3(tuple) _rrep3 tuple
#define _trrep4(tuple) _rrep4 tuple
#define _rrep1(n) for(lint i=n-1;i>=0;--i)
#define _rrep2(i,n) for(lint i=n-1;i>=0;--i)
#define _rrep3(i,a,b) for(lint i=b-1;i>=a;--i)
#define _rrep4(i,a,b,c) for(lint i=a+(b-a-1)/c*c;i>=a;i-=c)
#define rep(...) _vcppunko4((__VA_ARGS__,_trep4,_trep3,_trep2,_rep1))((__VA_ARGS__))
#define per(...) _vcppunko4((__VA_ARGS__,_trrep4,_trrep3,_trrep2,_rrep1))((__VA_ARGS__))
#define each(c) for(auto &e:c)
#pragma endregion

#pragma region io
template<class T>
istream& operator>>(istream& is,vector<T>& vec);
template<class T,size_t size>
istream& operator>>(istream& is,array<T,size>& vec);
template<class T,class L>
istream& operator>>(istream& is,pair<T,L>& p);
template<class T>
ostream& operator<<(ostream& os,vector<T>& vec);
template<class T,class L>
ostream& operator<<(ostream& os,pair<T,L>& p);
template<class T>
istream& operator>>(istream& is,vector<T>& vec){ for(T& x: vec) is>>x;return is; }
template<class T,class L>
istream& operator>>(istream& is,pair<T,L>& p){ is>>p.first;is>>p.second;return is; }
template<class T,class L>
ostream& operator<<(ostream& os,pair<T,L>& p){ os<<p.first<<" "<<p.second;return os; }
template<class T>
ostream& operator<<(ostream& os,vector<T>& vec){ os<<vec[0];rep(i,1,vec.size())os<<' '<<vec[i];return os; }
template<class T>
ostream& operator<<(ostream& os,deque<T>& deq){ os<<deq[0];rep(i,1,deq.size())os<<' '<<deq[i];return os; }

#ifdef __ENV_TQK__
#include<Windows.h>
HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
inline void in(){ SetConsoleTextAttribute(hConsole,10); }
template <class Head,class... Tail>
inline void in(Head&& head,Tail&&... tail){
	SetConsoleTextAttribute(hConsole,15);
	cin>>head;in(move(tail)...);
}
#else
inline void in(){}
template <class Head,class... Tail>
inline void in(Head&& head,Tail&&... tail){ cin>>head;in(move(tail)...); }
#endif

inline bool out(){ return(cout<<'\n',0); }
template <class T>
inline bool out(T t){ return(cout<<t<<'\n',0); }
template <class Head,class... Tail>
inline bool out(Head head,Tail... tail){ cout<<head<<' ';out(move(tail)...);return 0; }
template <class T>
inline void alloc(T &c,lint s){ rep(c.size())c[i].resize(s); }
#define alc alloc
#ifdef __ENV_TQK__
inline bool deb(){ SetConsoleTextAttribute(hConsole,10); return(cout<<'\n',0); }
template <class T>
inline bool deb(T t){ return(SetConsoleTextAttribute(hConsole,12),cout<<t<<'\n',SetConsoleTextAttribute(hConsole,10),0); }
template <class Head,class... Tail>
inline bool deb(Head head,Tail... tail){
	SetConsoleTextAttribute(hConsole,12);
	cout<<head<<' ';deb(move(tail)...);return 0;
}
#define dsp(ex) sp(ex)
#define dno(ex) no(ex)
#define look(v) SetConsoleTextAttribute(hConsole,12),cout<<#v<<": ",deb(v);
#else
#define deb(...) 0
#define dsp(ex) 0
#define dno(ex) 0
#define look(v) 0
#endif

#pragma endregion

#pragma region TA
#define lin(...) lint __VA_ARGS__;in(__VA_ARGS__)
#define stin(...) string __VA_ARGS__;in(__VA_ARGS__)
#define vin(type,name,size) vector<type> name(size);in(name)
#define tvin(ty1,ty2,name,size,val) vector<ty1>_in_vec(size);vector<ty2>a(size);in(_in_vec);{ty1 e;rep(size)e=_in_vec[i],name[i]=val;}
#define all(v) v.begin(),v.end()
#define pb push_back
#define fi e.first
#define se e.second
#define YES(c) cout<<((c)?"YES\n":"NO\n"),0
#define Yes(c) cout<<((c)?"Yes\n":"No\n"),0
#define POSSIBLE(c) cout<<((c)?"POSSIBLE\n":"IMPOSSIBLE\n"),0
#define Possible(c) cout<<((c)?"Possible\n":"Impossible\n"),0
#define o(p) cout<<p<<endl,0
#define sp(p) cout<<p<<" ",0
#define no(p) cout<<p,0
#define psort(l,r) if(l>r)swap(l,r);
inline constexpr lint gcd(lint a,lint b){ if(!a||!b)return 0;while(b){ lint c=b;b=a%b;a=c; }return a; }
template<typename T>
inline constexpr bool chmin(T &mn,const T &cnt){ if(mn>cnt){ mn=cnt;return 1; } else return 0; }
template<typename T>
inline constexpr bool chmax(T &mx,const T &cnt){ if(mx<cnt){ mx=cnt;return 1; } else return 0; }
#define ve(type) vector<type>
#define fn(ty1,ty2,ex) [](ty1 l,ty2 r){ return(ex); }
#define lfn(ex) [](lint l,lint r){ return(ex); }
template<typename T,class F>
T fold(vector<T>a,F f,T e=0,lint l=0,lint r=linf){ for(lint i=l;i<r&&i<a.size();++i)e=f(e,a[i]);return e; }

#pragma endregion

#pragma region mint
#define md_tmp template<uint_fast64_t md=1000000007>
md_tmp class modint{
	using u64=uint_fast64_t;

public:
	u64 a;

	constexpr modint(const lint x=0) noexcept: a((x+md)%md){}
	constexpr u64 &value() noexcept{ return a; }
	constexpr const u64 &value() const noexcept{ return a; }
	constexpr modint operator+(const modint rhs) const noexcept{
		return modint(*this)+=rhs;
	}
	constexpr modint operator-(const modint rhs) const noexcept{
		return modint(*this)-=rhs;
	}
	constexpr modint operator*(const modint rhs) const noexcept{
		return modint(*this)*=rhs;
	}
	constexpr modint operator^(const lint rhs) const noexcept{
		return modint(*this)^=rhs;
	}
	constexpr modint operator/(const modint rhs) const noexcept{
		return modint(*this)/=rhs;
	}
	constexpr modint &operator+=(const modint rhs) noexcept{
		a+=rhs.a;
		if(a>=md)a-=md;
		return *this;
	}
	constexpr modint &operator-=(const modint rhs) noexcept{
		if(a<rhs.a)a+=md;
		a-=rhs.a;
		return *this;
	}
	constexpr modint &operator*=(const modint rhs) noexcept{
		a=a*rhs.a%md;
		return *this;
	}
	constexpr modint &operator^=(const lint rhs) noexcept{
		if(!rhs)return *this=1;
		u64 exp=rhs-1;
		modint base=this->a;
		while(exp){
			if(exp&1)*this*=base;
			base*=base;
			exp>>=1;
		}
		return *this;
	}
	constexpr modint &operator/=(const modint rhs) noexcept{
		a=(*this*(rhs^(md-2))).a;
		return *this;
	}
};
using mint=modint<>;
md_tmp istream& operator>>(istream& os,modint<md>& m){
	os>>m.a,m.a%=md;
	return os;
}
md_tmp ostream& operator<<(ostream& os,const modint<md>& m){
	return os<<m.a;
}
//md_tmp modint<md> ncr(lint n,lint r){//O(r)//use bigncr
//	if(n<r||n<0||r<0)return modint<md>(0);
//	modint<md>ncr_res=1,ncr_div=1;
//	rep(r)ncr_res*=(n-i),ncr_div*=(r-i);
//	return ncr_res/ncr_div;
//}
//lint ncri(lint n,lint r){//O(r)
//	if(n<r||n<0||r<0)return 0;
//	lint ncr_res=1,ncr_div=1;
//	rep(r)ncr_res*=(n-i),ncr_div*=(r-i);
//	return ncr_res/ncr_div;
//}
#ifndef _AOJ_
modint<> operator""m(const unsigned long long n){ return modint<>(n); }
#endif
#pragma endregion

#pragma region P
class P{ public:lint f,s; P(lint a,lint b):f(a),s(b){}; P():f(0),s(0){}; };
istream& operator>>(istream& os,P& p){ os>>p.f>>p.s;return os; }
constexpr bool operator<(const P& l,const P& r){ return(l.f-r.f?l.f<r.f:l.s<r.s); }
constexpr bool operator>(const P& l,const P& r){ return(l.f-r.f?l.f>r.f:l.s>r.s); }
constexpr bool operator<=(const P& l,const P& r){ return!(l.f-r.f?l.f>r.f:l.s>r.s); }
constexpr bool operator>=(const P& l,const P& r){ return!(l.f-r.f?l.f<r.f:l.s<r.s); }
#pragma endregion

#pragma region rec_lambda
/*
usage: 
	auto res=rec([&](auto f,int n...){
		if(n<2)return n;
		return f(n-=2);
	})(114514);
*/
template<typename F>
#if defined(__has_cpp_attribute) && __has_cpp_attribute(nodiscard)
[[nodiscard]]
#elif defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ >= 4)
__attribute__((warn_unused_result))
#endif  // defined(__has_cpp_attribute) && __has_cpp_attribute(nodiscard)
static inline constexpr decltype(auto)
rec(F&& f) noexcept{
	return[f = std::forward<F>(f)](auto&&... args) {
		return f(f,std::forward<decltype(args)>(args)...);
	};
}
#pragma endregion

#pragma region start
struct Start{
	Start(){
#ifndef _C_INPUT_
		cin.tie(0),cout.tie(0);
		ios::sync_with_stdio(0);
#endif
		cout<<fixed<<setprecision(10);
	}
} __start;
#pragma endregion

#pragma endregion

#pragma region const
#define MAXN 101010
#define mod 1000000007//998244353
const ld pi=3.14159265358979323846;
const ld tau=(1.+sqrt(5))/2.;
P d4[4]={P(1,0),P(0,1),P(-1,0),P(0,-1)};
P d8[8]={P(1,0),P(1,1),P(0,1),P(-1,1),P(-1,0),P(-1,-1),P(0,-1),P(1,-1)};
#pragma endregion

//solve{

//BEGIN CUT HERE
template <typename T,typename E>
struct SegmentTree{
	using F = function<T(T,T)>;
	using G = function<T(T,E)>;
	using H = function<E(E,E)>;
	int n,height;
	F f;
	G g;
	H h;
	T ti;
	E ei;
	vector<T> dat;
	vector<E> laz;
	SegmentTree(F f,G g,H h,T ti,E ei):
		f(f),g(g),h(h),ti(ti),ei(ei){
	}

	void init(int n_){
		n=1;height=0;
		while(n<n_) n<<=1,height++;
		dat.assign(2*n,ti);
		laz.assign(2*n,ei);
	}

	void build(const vector<T> &v){
		int n_=v.size();
		init(n_);
		for(int i=0;i<n_;i++) dat[n+i]=v[i];
		for(int i=n-1;i;i--)
			dat[i]=f(dat[(i<<1)|0],dat[(i<<1)|1]);
	}

	inline T reflect(int k){
		return laz[k]==ei?dat[k]:g(dat[k],laz[k]);
	}

	inline void propagate(int k){
		if(laz[k]==ei) return;
		laz[(k<<1)|0]=h(laz[(k<<1)|0],laz[k]);
		laz[(k<<1)|1]=h(laz[(k<<1)|1],laz[k]);
		dat[k]=reflect(k);
		laz[k]=ei;
	}

	inline void thrust(int k){
		for(int i=height;i;i--) propagate(k>>i);
	}

	inline void recalc(int k){
		while(k>>=1)
			dat[k]=f(reflect((k<<1)|0),reflect((k<<1)|1));
	}

	void update(int a,int b,E x){
		if(a>=b) return;
		thrust(a+=n);
		thrust(b+=n-1);
		for(int l=a,r=b+1;l<r;l>>=1,r>>=1){
			if(l&1) laz[l]=h(laz[l],x),l++;
			if(r&1) --r,laz[r]=h(laz[r],x);
		}
		recalc(a);
		recalc(b);
	}

	void set_val(int a,T x){
		thrust(a+=n);
		dat[a]=x;laz[a]=ei;
		recalc(a);
	}

	T query(int a,int b){
		if(a>=b) return ti;
		thrust(a+=n);
		thrust(b+=n-1);
		T vl=ti,vr=ti;
		for(int l=a,r=b+1;l<r;l>>=1,r>>=1){
			if(l&1) vl=f(vl,reflect(l++));
			if(r&1) vr=f(reflect(--r),vr);
		}
		return f(vl,vr);
	}

	template<typename C>
	int find(int st,C &check,T &acc,int k,int l,int r){
		if(l+1==r){
			acc=f(acc,reflect(k));
			return check(acc)?k-n:-1;
		}
		propagate(k);
		int m=(l+r)>>1;
		if(m<=st) return find(st,check,acc,(k<<1)|1,m,r);
		if(st<=l&&!check(f(acc,dat[k]))){
			acc=f(acc,dat[k]);
			return -1;
		}
		int vl=find(st,check,acc,(k<<1)|0,l,m);
		if(~vl) return vl;
		return find(st,check,acc,(k<<1)|1,m,r);
	}

	template<typename C>
	int find(int st,C &check){
		T acc=ti;
		return find(st,check,acc,1,0,n);
	}
};
//END CUT HERE


void solve(lint n, lint d, lint a, std::vector<lint> x, std::vector<lint> h){//O(nlognlogΣh)
	vector<P>so(n);rep(n)so[i]=P(x[i],h[i]);
	sort(all(so),[](P a,P b){return a.f<b.f;});
	rep(n)tie(x[i],h[i])=tie(so[i].f,so[i].s);
	auto f=[](int a,int b){return a+b;};
	auto g=[](int a,int b){return a+b;};
	int ti=0,ei=0;
	
	SegmentTree<lint,lint> t(f,g,g,ti,ei);
	lint next[200000]={};
	rep(n)next[i]=lower_bound(all(x),x[i]+2*d+1)-x.begin();
		t.build(h);//O(nlogn)
		lint need=0;
		rep(n){//O(n)
			lint c=t.query(i,i+1);//O(logn)
			if(c<=0)continue;
			lint k=(c+a-1)/a;
			need+=k;
			lint tugip=next[i];
			t.update(i,tugip,-a*k);//O(logn)
		}
	out(need);
}

//}//solve

int main(){
    lint N;
    scanf("%lld",&N);
    lint D;
    scanf("%lld",&D);
    lint A;
    scanf("%lld",&A);
    std::vector<lint> X(N);
    std::vector<lint> H(N);
    for(int i = 0 ; i < N ; i++){
        scanf("%lld",&X[i]);
        scanf("%lld",&H[i]);
    }
    solve(N, D, A, std::move(X), std::move(H));
}

//sub-EOF


Measured memory_bytes: 16256