T = []
t = "NUPC"
for a in (1, 2):
    for b in (1, 2):
        for c in (1, 2):
            for d in (1, 2):
                res = ''
                for i in range(4):
                    ti = t[i]
                    res += ti
                    if i == 0:
                        if a == 2:
                            res += res
                    elif i == 1:
                        if b == 2:
                            res += res
                    elif i == 2:
                        if c == 2:
                            res += res
                    else:
                        if d == 2:
                            res += res
                T.append(res)
T.sort()
k = int(input())
print(T[k - 1])