#include<stdio.h>

int main(void){
	unsigned long long int x,k,i,e=1,c;
	scanf("%llu",&x);
	k = x;
	for(i = 2;i*i <= k;i++){
		if(!(x % i)){
			c = 0;
			while(!(x % i)){
				c = !(c);
				x/=i;
			}
			if(c){e*=i;}
		}
	}
	if(x != 1){e*=x;}
	printf("%llu\n",e);
	return 0;
}