N = int(input())
if N==1:
    exit(print(2))
if N==2:
    exit(print(3))

res = float('inf')
for i in range(1, N+1):
    if i*i>N:
        break
    if N%i==0:
        if N//i-1>i:
            res = min(res, N//i-1)
for i in range(1, 40):
    f = False
    for j in range(2,N+1):
        sm = 1
        for k in range(i+1):
            sm += pow(j, k+1)
            if sm>N:
                f = True
                break
        else:
            if N%sm == 0 and N//sm<j:
                res = min(res, j)
        if f:
            break
print(res)