#include<bits/stdc++.h>

#define eps 1e-15

typedef long long LoveLive;

struct point{

	LoveLive x,y;double deg;

	inline bool operator <(const point&rhs)const{return deg<rhs.deg;}

}a[1501],b[1501];

inline int readint(){

	int c=getchar(),d=0,f=0;

	for(;!isdigit(c);c=getchar())f=c=='-';

	for(;isdigit(c);c=getchar())d=(d<<3)+(d<<1)+(c^'0');

	return f?-d:d;

}

int n;unsigned ans=0;

int main(){

	n=readint();

	for(int i=1;i<=n;++i)a[i].x=readint(),a[i].y=readint();

	for(int i=1;i<=n;++i){

		memcpy(b,a,sizeof a);

		std::swap(b[i],b[1]);

		for(int j=2;j<=n;++j)

		b[j].deg=atan2(b[j].y-b[1].y,b[j].x-b[1].x);

		std::sort(b+2,b+n+1);

		int p1=2,p2=3,n1,n2;

		for(;p1<=n;++p1){

			n1=n2=1;

			while((p2>=p1&&b[p2].deg-b[p1].deg<M_PI_2-eps)||(p2<p1&&b[p1].deg-b[p2].deg>M_PI_2*3+eps)){

				++p2;

				if(p2>n)p2=2;

				if(p2==p1)break;

			}

			if(p1==p2)break;

			if((p2>=p1&&b[p2].deg-b[p1].deg>M_PI_2+eps)||(p2<p1&&b[p1].deg-b[p2].deg<M_PI_2*3-eps))continue;

			while(p1<n&&fabs(b[p1].deg-b[p1+1].deg)<eps)++p1,++n1;

			while(p2<n&&fabs(b[p2].deg-b[p2+1].deg)<eps)++p2,++n2;

			ans+=n1*n2;

		}

	}

	printf("%u\n",ans);

	return 0;

}