from heapq import heappop,heappush
n,k = map(int,input().split())
sx,sy,gx,gy = map(int,input().split())
xy = [(sx,sy)]+[tuple(map(int,input().split())) for _ in range(n)]+[(gx,gy)]
dist = [[0]*(n+2) for _ in range(n+2)]
for i,(ix,iy) in enumerate(xy):
    for j,(jx,jy) in enumerate(xy): dist[i][j] = abs(ix-jx)+abs(iy-jy)
ng = 0; ok = dist[0][n+1]
while ok-ng>1:
    mid = (ng+ok)//2
    d = [10**9]*(n+2); hq = [(0,0)]
    while hq:
        v,p = heappop(hq)
        if d[p]!=10**9: continue
        d[p] = v
        for i in range(n+2):
            if d[i]==10**9: heappush(hq,(d[p]+(dist[p][i]-1)//mid,i))
    if d[n+1]<=k: ok = mid
    else: ng = mid
print(ok)