#include<bits/stdc++.h>
#define int long long
using namespace std;

struct ryy{
    int x,y;
}a[1000000];

bool Map[100000][10000];
int ans;
int maxx = -INT_MAX;
int maxy = -INT_MAX;

int cmp(ryy x,ryy y){
    return x.x > y.x;
}
int maxans = -INT_MAX;
main()
{
    int n;
    cin >> n;
    for(int i=1;i<=n;i++){
        cin >> a[i].x >> a[i].y;
        Map[a[i].x][a[i].y] = 1;
        maxx = max(a[i].x,maxx);
        maxy = max(a[i].y,maxy);
    }
    sort(a+1,a+1+1,cmp);
    for(int i=1;i<=n;i++){
        for(int j=1;j<=maxx;j++){
            if(Map[j][a[i].y] == 1)
                ans++;
        }
        maxans = max(ans,maxans);
        ans = 1;
        for(int j=1;j<=maxy;j++){
            if(Map[a[i].x][j] == 1)
                ans++;
        }
        ans = 1;
        for(int j=1;j<=min(maxx,maxy);j++){
            if(Map[a[i].x+j][a[i].y+j] == 1)
                ans++;
        }
        maxans = max(ans,maxans);
        ans = 0;
    }
    cout << maxans << endl;
    return 0;
}