dat=[""]
nupc='NUPC'
for i in range(4):
    for j in range(len(dat)):
        dat[j]+=nupc[i]
    newdat=[]
    for d in dat:
        newdat.append(d)
        newdat.append(d+d)
    dat=newdat
dat.sort()
K=int(input())
print(dat[K-1])