Codeforces Beta Round #53 A. Square Earth?
def d(n,x,y): if y==0: return x if x==n: return n+y if y==n: return 3*n-x if x==0: return 4*n-y return -1 n,x1,y1,x2,y2 = map(int,raw_input().split()) d1 = d(n,x1,y1) d2 = d(n,x2,y2) print min(abs(d2-d1),4*n-abs(d2-d1))