Ia ba

#include <iostream>
#include <fstream>
#include <algorithm>

using namespace std;

ifstream fin ("cerc3.in");
ofstream fout ("cerc3.out");

struct cerc{
    int dreapta;
    int stanga;
};

cerc v[1000];

bool comp(cerc a, cerc b)
{
    return a.dreapta < b.dreapta;
}

int main()
{
    int n, i, x, y;
    fin >> n;
    for(i = 0; i < n; i++)
    {
        fin >> x >> y;
        v[i].dreapta = x + y;
        v[i].stanga = x - y;
    }
    sort(v, v + n, comp);
    int k = 1;
    int capat = v[0].dreapta;
    for(i = 1; i < n; i++)
    {

        if(v[i].stanga > capat)
        {
            k++;
            capat = v[i].dreapta;
        }
    }
    fout << k << endl;
    return 0;
}