ABC248 E - K-colinear Line

def colinear_line(x0,y0,x1,y1,x,y):
    return (x1-x0)*(y-y0) == (y1-y0)*(x-x0)
 
n,k_ = map(int,input().split())
xy = [list(map(int,input().split())) for _ in range(n)]
 
ans = set()
for i in range(n):
    for j in range(i+1,n):
        group = []
        (x1,y1),(x2,y2) = xy[i],xy[j]
        group.append(i)
        group.append(j)
        for k in range(n):
            if k == i or k == j:
                continue
            x,y = xy[k]
            if colinear_line(x1,y1,x2,y2,x,y):
                group.append(k)
        group = tuple(sorted(group))
        if len(group) >= k_ and group not in ans:
            ans.add(group)
print(len(ans) if k_ != 1 else 'Infinity')