import itertools
a = []

g = ["NUPC"]

for p, q in itertools.product(g, range(16)):
	t = ""
	for i in range(4):
		t += p[i]
		if q >> i & 1:
			t += t
	a.append(t)

a.sort()

#print(a)

k = int(input())
print(a[k-1])