#include <bits/stdc++.h>
#include <math.h>

#include <stdint.h>

typedef uint8_t  u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef int8_t   s8;
typedef int16_t  s16;
typedef int32_t  s32;
typedef int64_t  s64;

const int INF = (1 << 28);
const long INFL = (1LL << 50);

class MillerRabin {
public:
  u64 modmul_64(u64 a, u64 b, u64 mod) {
    u64 res = 0;
    a %= mod;
    for(s32 i = 63; i >= 0; --i) {
      res = (res << 1) % mod;
      if( ((b >> i) & 0x01) == 1 ) {
        res = (res + a) % mod;
      }
    }
    return res;
  }
  u64 modpow_64(u64 a, u64 b, u64 mod) {
    u64 res = 1, p = a;
    a %= mod;
    b %= mod;
    while( b != 0 ) {
      if( (b & 0x01) != 0 ) {
        res = modmul_64(res, p, mod);
      }
      p = modmul_64(p, p, mod);
      b >>= 1;
    }
    return res;
  }      
  bool operator () (u64 N) {
    u32 k = 16;
    if( N == 2 ) return true;
    if( N <= 1 or N % 2 == 0 ) return false;
    u64 d = (N - 1);
    u64 s = 0;
    while( d % 2 == 0 ) {
      d >>= 1;
      s += 1;
    }
    for(s32 i = 0; i < k; ++i) {
      u64 a = (((u64)rand() << 32) | (u64)rand()) % (N - 2) + 1;
      u64 r = modpow_64(a, d, N);
      if( r == 1 ) continue;
      if( r == N - 1 ) continue;
      for(s32 j = 1; j < s; ++j) {
        r = modpow_64(r, 2, N);
        if( r == N - 1 ) {
          goto label_1;
        }        
      }
      return false;
    label_1:;
    }
    return true;  
  }
};

template<typename T>
void Swap(T& arg1, T& arg2) {
  T temp = arg1;
  arg1 = arg2;
  arg2 = temp;
}

u32 gcd(u32 a, u32 b) {
  if( a < b ) Swap(a, b);
  while( b != 0 ) {
    a = a % b;
    Swap(a, b);
  }
  return a;
}

u64 gcd(u64 a, u64 b) {
  if( a < b ) Swap(a, b);
  while( b != 0 ) {
    a = a % b;
    Swap(a, b);
  }
  return a;
}

template<typename T>
T gcd(T a, T b) {
  if( a < b ) Swap(a, b);
  while( b != 0 ) {
    a %= b;
    Swap(a, b);
  }
  return a;
}

class PollardsRho {
public:
  u64 modmul_64(u64 a, u64 b, u64 mod) {
    u64 res = 0;
    a %= mod;
    for(s32 i = 63; i >= 0; --i) {
      res = (res << 1) % mod;
      if( ((b >> i) & 0x01) == 1 ) {
        res = (res + a) % mod;
      }
    }
    return res;
  }
  u64 operator () (u64 N) {
    u64 x = 2;
    u64 y = 2;
    u64 d = 1;
    while( d == 1 ) {
      x = modmul_64(x, x, N);
      u64 ty = modmul_64(y, y, N);
      y = modmul_64(ty, ty, N);
      d = gcd(llabs(x - y), N);
    }
    if( d == N ) {
      return 0;
    }
    return d;
  }
};
  
class PrimeFactorization {
public:
  u64 primes_[1024];
  u64 p_num_[1024];
  u64 num_;
  bool isnotprime[1000000];
public:
  void operator () (u64 N) {
    num_ = 0;
    //for(s32 i = 0; i < 1000000; ++i) isprime[i] = true;
    isnotprime[0] = isnotprime[1] = true;
    for(s32 i = 0; i < 1000; ++i) {
      if( not isnotprime[i] ) {
        for(s32 j = i + i; j < 1000000; j+=i) {
          isnotprime[j] = true;
        }
      }
    }
    for(s32 i = 2; i < 1000000; ++i) {
      if( isnotprime[i] ) continue;
      if( N % i == 0 and N != 0 ) {
        primes_[num_] = i;
        p_num_[num_] = 1;
        num_ += 1;
        N /= i;
        while( N % i == 0 and N != 0 ) {
          p_num_[num_ - 1] += 1;
          N /= i;
        }
      }
    }
    if( N == 1 ) return;
    split(N);
  }
  void split(u64 N) {
    if( N == 1 ) return;
    MillerRabin mr;
    for(s32 i = 0; i < num_; ++i) {
      if( N % primes_[i] == 0 ) {
        p_num_[i] += 1;
        split(N / primes_[i]);
        return;
      }
    }
    u64 root = (u64)sqrt(N);
    if( root * root == N ) {
      split(root);
      split(root);
      return;
    }
    if( mr(N) ) {
      primes_[num_] = N;
      p_num_[num_] = 1;
      num_ += 1;
      return;
    }
    u64 a, b;
    split2(N, a, b);
    split(a);
    split(b);
  }
  void split2(u64 N, u64& a, u64& b) {
    PollardsRho pr;
    a = pr(N);
    b = N / a;
  }
};


int main() {

  PrimeFactorization pf;

  long N;
  std::cin >> N;
  pf(N);

  long res = 1;
  for(int i = 0; i < pf.num_; ++i) {
    if( pf.p_num_[i] % 2 != 0 ) {
      res *= pf.primes_[i];
    }
  }

  std::cout << res << std::endl;
  
  return 0;
}