n = int(input())

mn = n-100
mx = n+100

nls = list(range(n-100, n+101))

d = nls[1:-1]

for i in [-3, -2, -1, 0, 1, 2, 3]:
    if i in d:
        d.remove(i)
#print(d)
#print(nls)

cnt = 0
while cnt <=2:
    for i in nls:
        for j in d:
            if i%j == 0:
                cnt +=1 
print(i)