ans = []
NUPC = "NUPC"
for s in range(16):
    temp = []
    for i in range(4):
        temp.append(NUPC[i])
        if (s >> i) & 1:
            temp = temp + temp
    ans.append("".join(temp))
ans.sort()
K = int(input()) - 1
print(ans[K])