#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int gcd(int x, int y) {
	if(y == 0) return x;
	return gcd(y, x % y);
}
int main() {
	int N;
	cin >> N;
	vector<int> X(N), Y(N);
	for(int i = 0; i < N; ++i) {
		cin >> X[i] >> Y[i];
	}
	vector<vector<int> > lines; // {a, b, c} --> ax + by + c = 0
	for(int i = 0; i < N; ++i) {
		for(int j = 0; j < i; ++j) {
			int a = Y[i] - Y[j];
			int b = -(X[i] - X[j]);
			int c = -(a * X[i] + b * Y[i]);
			int g = gcd(abs(a), gcd(abs(b), abs(c)));
			if(a < 0 || (a == 0 && b < 0)) {
				a *= -1, b *= -1, c *= -1;
			}
			lines.push_back({a / g, b / g, c / g});
		}
	}
	sort(lines.begin(), lines.end());
	lines.erase(unique(lines.begin(), lines.end()), lines.end());
	int ls = lines.size();
	vector<bool> ok(1 << N, false);
	ok[0] = true;
	for(int i = 0; i < N; ++i) {
		ok[1 << i] = true;
	}
	for(int i = 0; i < ls; ++i) {
		vector<int> online;
		for(int j = 0; j < N; ++j) {
			if(lines[i][0] * X[j] + lines[i][1] * Y[j] + lines[i][2] == 0) {
				online.push_back(j);
			}
		}
		sort(online.begin(), online.end(), [&](int va, int vb) {
			return lines[i][1] * (X[vb] - X[va]) - lines[i][0] * (Y[vb] - Y[va]) > 0;
		});
		int sz = online.size();
		for(int j = 0; j <= sz; ++j) {
			for(int k = j + 1; k <= sz; ++k) {
				int bit = 0;
				for(int l = j; l < k; ++l) {
					bit |= 1 << online[l];
				}
				ok[bit] = true;
			}
		}
	}
	/*
	for(int i = 0; i < ls; ++i) {
		cout << lines[i][0] << ' ' << lines[i][1] << ' ' << lines[i][2] << endl;
	}
	*/
	for(int i = 0; i < ls; ++i) {
		for(int j = 0; j < i; ++j) {
			for(int k = 0; k < j; ++k) {
				if(lines[i][0] * lines[j][1] == lines[i][1] * lines[j][0]) continue;
				if(lines[j][0] * lines[k][1] == lines[j][1] * lines[k][0]) continue;
				if(lines[k][0] * lines[i][1] == lines[k][1] * lines[i][0]) continue;
				vector<int> pos = { i, j, k };
				vector<int> sign(3);
				bool nonzero = true;
				for(int w = 0; w < 3; ++w) {
					int p0 = pos[w], p1 = pos[(w + 1) % 3], p2 = pos[(w + 2) % 3];
					long long val0 = lines[p0][2] * (lines[p2][0] * lines[p1][1] - lines[p1][0] * lines[p2][1]);
					long long val1 = lines[p1][2] * (lines[p0][0] * lines[p2][1] - lines[p2][0] * lines[p0][1]);
					long long val2 = lines[p2][2] * (lines[p0][0] * lines[p1][1] - lines[p1][0] * lines[p0][1]);
					long long val = (val0 + val1 - val2) * (lines[p2][0] * lines[p1][1] - lines[p1][0] * lines[p2][1] > 0 ? +1 : -1);
					if(val == 0) {
						nonzero = false;
						break;
					}
					sign[w] = (val > 0 ? +1 : -1);
				}
				if(!nonzero) continue;
				int bit = 0;
				for(int l = 0; l < N; ++l) {
					int vali = lines[i][0] * X[l] + lines[i][1] * Y[l] + lines[i][2];
					int valj = lines[j][0] * X[l] + lines[j][1] * Y[l] + lines[j][2];
					int valk = lines[k][0] * X[l] + lines[k][1] * Y[l] + lines[k][2];
					if(vali * sign[0] >= 0 && valj * sign[1] >= 0 && valk * sign[2] >= 0) {
						bit |= 1 << l;
					}
				}
				ok[bit] = true;
			}
		}
	}
	int res = 0;
	for(int i = 0; i < (1 << N); ++i) {
		if(ok[i]) {
			/*
			for(int j = 0; j < N; ++j) {
				cout << ((i >> j) & 1);
			}
			cout << endl;
			*/
			++res;
		}
	}
	cout << res << endl;
	return 0;
}