#include <iostream>
#include <cstring>
#include <cstdio>
#define maxn 100+5
using namespace std;
int  main()
{
	freopen("asm_fuel.in","r",stdin);
	freopen("asm_fuel.out","w",stdout);
	int t,n;
	cin>>n; 
	int count=0,maxc;   
    int x[maxn],y[maxn];
	float b,k;
	for(int i=1;i<=n;i++)
	  cin>>x[i]>>y[i];
	{t=1;	
	 k=( x[t]-x[t+=1] )/( y[t]-y[t+=1] );
	 b=y[t]-k*x[t];
    }
    for(int i=t;i<=n;i++)
    {if( x[t+i]*k + b == y[t+i] );
     count++;
     maxc=count;
    }
	cout<<maxc;	
	return 0;
}