n = int(input()) m = [[0]*n for x in range(n)] p = 1 for i in range(1,n+1): s = list(range((i-1)*n+1,i*n+1))[::p] for j in range(len(s)): m[j][i-1] = s[j] p = p*(-1) for i in m: for j in i: print(str(j).rjust(3),end = '') print()