#include<stdio.h>

typedef long long int ln;

void run(void){

  ln x,y;
  scanf("%lld",&x);
  y=1;

  ln k=2;
  while(k*k<=x){
    if(x%(k*k)==0){
      x/=k*k;
    } else if (x%k==0){
      x/=k;
      y*=k;
    } else {
      k++;
    }
  }

  if(x>1) y*=x;

  printf("%lld\n",y);
  return;
}

int main(void){
  run();
  return 0;
}