#include <cstdio>

int main(void) {
  long long int x;
  scanf("%lld", &x);

  long long int i = 2;
  long long int answer = 1;

  while (true) {
    long long int j = 0;
    while (x % i == 0) {
      x /= i;
      j++;
    }
    if (j % 2 == 1) answer *= i;
    if (x == 1) break;
    i++;
  }

  printf("%lld\n", answer);

  return 0;
}