n=int(input())
assert 4<=n<=400
xy=[list(map(int,input().split())) for _ in range(n)]
for x,y in xy:
    assert -1000<=x<=1000
    assert -1000<=y<=1000
for i in range(n-2):
    for j in range(i+1,n-1):
        for k in range(j+1,n):
            x1,y1=xy[i]
            x2,y2=xy[j]
            x3,y3=xy[k]
            #(y1-y2)/(x1-x2) = (y1-y3)/(x1-x3) -> 同一直線上
            assert (x1-x2)*(y1-y3) != (y1-y2)*(x1-x3)