#include<bits/stdc++.h>
using namespace std;
#define Study ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define ll long long
#define ull unsigned long long
#define pb push_back
#define ff first
#define ss second
#define ins insert
#define all(x) x.begin(),x.end()
#define fori(x,y,z) for(ll x=y;x<=z;x++)
const ll INF=1e9;
const ll sz=2e5+10;
const ll mod=1e9+7;
ll fw[sz];
void update(ll ind,ll val){
while(ind<sz){
fw[ind]=max(fw[ind],val);
ind+=(ind&(-ind));
}
}
ll query(ll ind){
ll res=0;
while(ind>0){
res=max(fw[ind],res);
ind-=(ind&(-ind));
}
return res;
}
void work(){
ll n;
cin>>n;
vector<ll>dp(sz);
vector<vector<ll>>upd(sz);
ll ans=0;
fori(i,1,n){
ll l,r;
cin>>l>>r;
if(i-1<=l)
dp[i]=1;
else
dp[i]=query(i-l-1)+1;
ans=max(ans,dp[i]);
upd[min(i+r,n)].pb(i);
for(auto x: upd[i])
update(x,dp[x]);
}
cout<<ans;
}
int main(){
Study;
ll t=1;
//cin>>t;
fori(i,1,t){
work();
}
}
