#include <bits/stdc++.h>
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int n;
std::cin >> n;
std::vector<int> l(n + 1), r(n + 1);
for(int i = 1; i <= n; i++) {
std::cin >> l[i] >> r[i];
}
std::vector<int> dp(n + 1, 1);
for(int i = 1; i <= n; i++) {
for(int j = i - l[i] - 1; j > 0; j--) {
if(i > j + r[j]) {
dp[i] = std::max(dp[i], dp[j] + 1);
}
}
}
int ans = 0;
for(int i = 1; i <= n; i++) {
//std::cout << dp[i] << " ";
ans = std::max(dp[i], ans);
}
std::cout << "\n";
std::cout << ans;
}
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