N=int(input ())
if N+90%2==0:
    print (N+90)
else:
    print (N+91)
#
'''
i=N-100
e=0
while i<=N+100 and e==0:
    j=2
    while e==0:
        if i%j==0:
            print (i)
            e=1
        j+=1
    i+=1
'''