#!/bin/python3 import sys n = int(input().strip()) # your code goes here A=[] for a in range(1,n): B=[] for b in range(1,n): P={(0,0)} c=0 f=True V=set() while f: c+=1 Q=set() V=V|P for p in P: if (p[0]==n-1)&(p[1]==n-1): f=False break if (0<=p[0]+a