#include <iostream>
#include <algorithm>
#include <cstdio>
using namespace std;
#include <algorithm>
#include <cstdio>
using namespace std;
struct race
{
int first;
int second;
};
{
int first;
int second;
};
bool cmp(race a,race b)
{
return a.second < b.second;
}
int main()
{
struct race a[100009];
int i,n,c=1,j;
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d%d",&a[i].first,&a[i].second);
}
sort(a,a+n,cmp);
for(i=1,j=0;i<n;i++)
{
if(a[i].first>=a[j].second){
c++;
j=i;
}
}
printf("%d",c);
return 0;
}
{
return a.second < b.second;
}
int main()
{
struct race a[100009];
int i,n,c=1,j;
scanf("%d",&n);
for(i=0;i<n;i++)
{
scanf("%d%d",&a[i].first,&a[i].second);
}
sort(a,a+n,cmp);
for(i=1,j=0;i<n;i++)
{
if(a[i].first>=a[j].second){
c++;
j=i;
}
}
printf("%d",c);
return 0;
}