#include using namespace std; using ll = long long; using P = pair; #define enld '\n' #define rep(i,n) for(int i=0; i<(n); i++) #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #pragma GCC optimize("Ofast") constexpr ll INF = 1e18; constexpr int inf = 1e9; constexpr ll mod = 1000000007; constexpr ll mod2 = 998244353; const double PI = 3.1415926535897932384626433832795028841971; const int dx[6] = {1, 0, -1, 0,1,1}; const int dy[6] = {0, 1, 0, -1,1,-1}; template inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; } // --------------------------------------------------------------------------- int main(){ ios::sync_with_stdio(false); cin.tie(nullptr); int N; cin >> N; vector A(N),B(N); for(int i=0; i> A[i] >> B[i]; } int ans = 0; for(int i=0; i