#include<iostream>
#include<cmath>
#define size 100
using namespace std;
struct MANGDIEM
{
    float x;
    float y;
}A[size];
void nhapxuat(int &n)
{
    //int n;
    cout<<"co so diem la ";
    cin>> n;
    cout<<"\nnhap toa do cac diem";
    for(int i=1;i<=n;i++)
    {
        cout<<"\ndiem thu ["<<i<<"]"<<" co hoanh do,tung do lan luot la ";
        cin>>A[i].x>>A[i].y;
    }
    for(int i=1;i<=n;i++)
    {
        cout<<"\ndiem thu ["<<i<<"] la ("<<A[i].x<<";"<<A[i].y<<")";
    }
}
void dem()
{
    int n;
    int dem1=0;
    for(int i=1;i<=n;i++)
    {
        if(A[i].x>0)
            dem1++;
    }
    cout<<"\nco "<<dem1<<" diem co hoanh do duong";
}
void diemtrung()//tim diem trung nhau
{
    int n,dem=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<i;j++)
        {
            if(A[i].x==A[j].x&&A[i].y==A[j].y)
                dem++;
        }
    }
cout<<dem;
}
void timmax()//tim hoanh do max
{
    int n,max = A[0].x;
    for (int i = 1; i < n; i++)
        {
            if (max < A[i].x)
            max = A[i].x;
        }
cout<<max;
}
int main()
{
    int n;
    nhapxuat(n);
    dem();
    diemtrung();
    timmax();
    return 0;
}