#include <bits/stdc++.h>
using ll = long long;
int main(){
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);
    ll n;
    std::cin >> n;
    std::vector<std::vector<ll>> buildings(n , std::vector<ll>(2));
    for(int i = 0 ; i < n; i++){
        ll a , b;
        std::cin >> a >> b;
        buildings[i][0] = a;
        buildings[i][1] = b;
    }
    //first subtask
     std::cout <<n;
}
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