#include "bits/stdc++.h"
using namespace std;
#ifdef LOCAL
#include "debug.h"
#else
#define debug(x...)
#endif
using db = long double;
constexpr db EPS = 1e-8;
struct Point {
int x, y;
db len2(Point p0) {
return (x - p0.x) * (x - p0.x) + (y - p0.y) * (y - p0.y);
}
};
db PolarAngle(Point p, Point p0) {
return atan2(1.0 * (p.y - p0.y), 1.0 * (p.x - p0.x));
}
void solve() {
int n, xc, yc;
cin >> n >> xc >> yc;
vector<Point> pts(n);
for (int i = 0; i < n; i++) {
cin >> pts[i].x >> pts[i].y;
}
for (int i = 0; i < n; i++) {
Point p0 = pts[i];
vector<Point> srt = pts;
sort(srt.begin(), srt.end(), [&](Point lhs, Point rhs) {
if (fabs(PolarAngle(lhs, p0) - PolarAngle(rhs, p0)) < EPS) {
return lhs.len2(p0) < rhs.len2(p0);
}
return PolarAngle(lhs, p0) < PolarAngle(rhs, p0);
});
}
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(NULL);
int tests = 1;
// cin >> tests;
while (tests--) {
solve();
}
return 0;
}