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