from collections import defaultdict

def solve():
    n = int(input())
    ansdict = defaultdict(lambda: True)
    for i in range(1, n//3+1):
        for j in range(i, n*2//3):
            t = tuple(sorted([i, j, n-i-j]))
            if ansdict[t]:
                ansdict[t] = False
    for ans in sorted(list(ansdict.keys())):
        print(" ".join(map(str, ans)))

if __name__=="__main__":
    solve()