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#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

typedef uint32_t ul;
typedef int32_t l;
typedef uint64_t ull;
typedef int64_t ll;

template <typename T>
using statistics_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

const l INF = 1000000000 + 9;
const ll MOD = 1e9+7;
const l PRIME = 200003;
const ll L_INF = 1000000000000000000LL + 7;
const double EPS = 1e-5;

#define FOR(x, y, z) for (ll z = x; z < y; z++)
#define FORE(x, y, z) for (ll z = x; z <= y; z++)
#define FORD(x, y, z) for (ll z = x; z > y; z--)
#define FORDE(x, y, z) for (ll z = x; z >= y; z--)
#define REP(x, y) for (l y = 0; y < x; y++)
#define ALL(...) (__VA_ARGS__).begin(), (__VA_ARGS__).end()

#define PF push_front
#define POF pop_front
#define PB push_back
#define POB pop_back
#define MP make_pair
#define FS first
#define SC second

const l MAXN = 1005;

l n;
ll randd[MAXN];
ll pos[MAXN], rad[MAXN];

bool visited[MAXN];

set<pair<ll, ll> > S;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    srand(time(nullptr));

    cin >> n;
    FORE(1, n, i)
    {
        cin >> pos[i] >> rad[i];
        randd[i] = rand()+1;
    }

    REP(1LL << n, mask)
    {
        ll ksor{0}, mult{1};
        queue<l> Q;
        fill(visited, visited+n+1, false);

        FORE(1, n, i)
            if((1LL << (i-1)) & mask)
            {
                Q.push(i);
                visited[i] = true;
            }

        while(!Q.empty())
        {
            l i{Q.front()};
            Q.pop();

            ksor ^= randd[i];
            mult = (mult*randd[i])%MOD;

            FORE(1, n, j)
                if(!visited[j] && abs(pos[i]-pos[j]) <= rad[i])
                {
                    visited[j] = true;
                    Q.push(j);
                }
        }

        S.insert({ksor, mult});
    }

    cout << S.size() << "\n";
}