import math
N=int(input())
div=[]
for d in range(1,10**6):
    if N%d==0:
        div+=[d,N//d]

ans = N + 1

for d in div:
    n = N // d
    for L in range(1,60):
        ok = n + 1 if L == 1 else (1+int(math.pow(n, 1/(L-1))))
        ok = min(ok, n + 1)
        ng = d
        while ok - ng > 1:
            m = (ok + ng) // 2
            if (m**L - 1) / (m - 1) >= n:
                ok = m
            else:
                ng = m
        if ok > d and (ok**L - 1) % (ok - 1) == 0 and (ok**L - 1) // (ok - 1) == n:
            ans = min(ans, ok)
print(ans)