#include <bits/stdc++.h>
using namespace std;
#define modulo 1000000007
#define mod(mod_x) ((((long long)mod_x+modulo))%modulo)
#define Inf 10000000000000002


int main(){

	int n;
	scanf("%d",&n);
	
	vector<int> x(n),y(n);
	for(int i=0;i<n;i++)scanf("%d %d",&x[i],&y[i]);
	
	int ans = 0;
	
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			for(int k=j+1;k<n;k++){
				ans += abs((x[i]-x[j])*(y[i]-y[k]) - (x[i]-x[k]) * (y[i]-y[j]));
				if(ans>=modulo)ans-=modulo;
			}
		}
	}
	
	cout<<ans<<endl;

	return 0;
}