#include <stdio.h>

typedef unsigned long long uint64;

inline static void f(uint64 *X, uint64 *Y, uint64 i) {
    uint64 n=0;
    uint64 x=*X;

    while ((x%i)==0) {
        n^=1;
        x/=i;
    }
    (*Y)*=(n&1)?i:1;
    *X=x;
    return;
}

int main(){
    uint64 X;
    uint64 Y=1;
    uint64 i=2;

    scanf("%lld", &X);
    f(&X, &Y, i);
    i++;
    while ((i*i)<=X) {
        f(&X, &Y, i);
        i+=2;
    }

    printf ("%lld\n", X*Y);

    return 0;
}