Go: package main

import (
	"bufio"
	"fmt"
	"io"
	"math"
	"os"
	"strconv"
	"strings"
)

func main() {
	fmt.Println(resolve(parseProblem(os.Stdin)))
}

func parseProblem(r io.Reader) int {
	const (
		initialBufSize = 100000
		maxBufSize     = 1000000
	)
	buf := make([]byte, initialBufSize)

	sc := bufio.NewScanner(r)
	sc.Buffer(buf, maxBufSize)
	sc.Split(bufio.ScanWords) // bufio.ScanLines
	p, q := scanInt(sc), scanInt(sc)
	base := 1
	d := newRational(p, q).denomi
	for k := range primeFactories(d) {
		base *= k
	}
	return base
}

func isPrime(n int) bool {
	for i := 2; i*i <= n; i++ {
		if n%i == 0 {
			return false
		}
	}
	return true
}

func eratosthenes(n int) []bool {
	t := make([]bool, n)
	for i := 2; i < len(t); i++ {
		t[i] = true
	}
	for i := 2; i < len(t); i++ {
		if !t[i] {
			continue
		}
		for j := 2; j*i < len(t); j++ {
			t[j*i] = false
		}
	}
	return t
}

func primes(n int) chan int {
	ch := make(chan int)
	go func() {
		t := eratosthenes(n)
		for i := 2; i < len(t); i++ {
			if !t[i] {
				continue
			}
			ch <- i
		}
		close(ch)
	}()
	return ch
}

func primeFactories(n int) (terms map[int]int) {
	terms = map[int]int{}
	num := n
	for f := 2; f*f <= n; f++ {
		if num%f != 0 {
			continue
		}
		ex := 0
		for num%f == 0 {
			num /= f
			ex++
		}
		terms[f] = ex
	}
	if num > 1 {
		terms[num] = 1
	}
	return
}

type rational struct {
	frac, denomi int
	neg          int
}

func newRational(frac, denomi int) rational {
	r := rational{frac: frac, denomi: denomi}
	r.canonicalize()
	return r
}

func ratMul(x, y rational) rational {
	r := rational{
		frac:   x.frac * y.frac,
		denomi: x.denomi * y.denomi,
	}
	r.canonicalize()
	return r
}

func ratDiv(x, y rational) rational {
	return ratMul(x, ratInv(y))
}

func ratInv(x rational) rational {
	return rational{frac: x.denomi, denomi: x.frac}
}

func ratAdd(x, y rational) rational {
	r := rational{
		frac:   x.frac*y.denomi + y.frac*x.denomi,
		denomi: x.denomi * y.denomi,
	}
	r.canonicalize()
	return r
}

func ratSub(x, y rational) rational {
	return ratAdd(x, rational{frac: -y.frac, denomi: y.denomi})
}

func (r rational) Float64() float64 {
	b := float64(r.frac) / float64(r.denomi)
	if r.neg == 1 {
		return -b
	}
	return b
}

func (r rational) String() string {
	b := fmt.Sprintf("%d/%d", r.frac, r.denomi)
	if r.neg == 1 {
		return "-" + b
	}
	return b
}

func (r rational) equal(other rational) bool {
	r.canonicalize()
	other.canonicalize()

	return r.neg == other.neg &&
		r.frac == other.frac &&
		r.denomi == other.denomi
}

func (r *rational) canonicalize() {
	if r.frac < 0 {
		r.neg ^= 1
		r.frac = -r.frac
	}
	if r.denomi < 0 {
		r.neg ^= 1
		r.denomi = -r.denomi
	}
	d := gcd(r.frac, r.denomi)
	r.frac /= d
	r.denomi /= d
}

func nextRational(sc *bufio.Scanner) rational {
	s := nextString(sc)
	i := strings.Index(s, ".")
	if i != -1 {
		decimalDigit := len(s) - i - 1
		fr, _ := strconv.Atoi(strings.Replace(s, ".", "", 1))
		return newRational(fr, int(math.Pow10(decimalDigit)))
	}
	i = strings.Index(s, "/")
	if i != -1 {
		fr, _ := strconv.Atoi(s[0:i])
		de, _ := strconv.Atoi(s[i+1 : len(s)])
		return newRational(fr, de)
	}
	fr, _ := strconv.Atoi(s)
	return newRational(fr, 1)
}
func gcd(a, b int) int {
	for b > 0 {
		t := a / b
		a, b = b, a-t*b
	}
	return a
}
func nextInt(sc *bufio.Scanner) int {
	sc.Scan()
	a, _ := strconv.Atoi(sc.Text())
	return int(a)
}

func nextString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

func resolve(n int) int {
	return n
}

// snip-scan-funcs
func scanInt(sc *bufio.Scanner) int {
	sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int(i)
}
func scanString(sc *bufio.Scanner) string {
	sc.Scan()
	return sc.Text()
}

C++: #include <iostream>
#include <vector>

using namespace std;
int gcd(int a, int b){
    if(b==0) return a;
    return gcd(b,a%b);
}

bool isPrime[100000];
typedef pair<int,int> P;

int main(){
    int p,q;
    cin>>p>>q;
    int d = gcd(p,q);
    q/=d;

    fill(isPrime,isPrime+100000,true);
    isPrime[0]=isPrime[1]=false;
    for(int i=2;i<100000;i++){
        if(!isPrime[i]) continue;
        for(int k=2;i*k<100000;k++) isPrime[k*i]=false;
    }
    int r = -1;
    vector<P> V;
    for(int i=2;i<q&&i<100000;i++){
        if(!isPrime[i]) continue;
        if(q%i==0){
            int cnt = 0;
            while(q%i==0){
                cnt++;
                q/=i;
            }
            if(r==-1){
                r = cnt;
            }else{
                r = gcd(r,cnt);
            }
            V.emplace_back(i,cnt);
        }
    }
    int ans = 1;
    for(auto v:V){
        int k = v.first;
        for(int i = 0;i<v.second/r;i++) ans*=k;
    }
    cout<<ans<<endl;
}

C++: #include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <string>
#include <vector>
#include <set>
#include <map>
#include <algorithm>

#define CH(N,A,B) (A<=N&&N<B)
#define REP(i,a,b) for(int i=a;i<b;i++)
#define RREP(i,a,b) for(int i=(b-1);a<=i;i--)

using namespace std;

int gcd(int a,int b)
{
	if (a%b==0)
	{
		return(b);
    }
	else
	{
		return(gcd(b,a%b));
    }
}

vector<bool> primes;
void make_primes(int n)
{
	primes.resize(n+1, true);
	primes[0] = primes[1] = false;
	REP(i, 2, sqrt(n))
	{
		if (primes[i])
		{
			for (int j = 0; i * (j + 2) < n; j++)
				primes[i * (j + 2)] = false;
		}
	}
	cout<<endl;
}

int main() {
  int p, q;
  cin>>p>>q;

	q = q/gcd(p,q); /*??????????´??????????????????????*/

	vector<int> sie;
	make_primes(q);
	REP(i,0,primes.size()){
		if(primes[i]) sie.push_back(i);
	}


	set<int> s;
	int t = 0;
	while(1){
		if(q % sie[t] == 0){
			s.insert(sie[t]);
			q /= sie[t];
		}else{
			t++;
		}
		if(q == 1){
			break;
		}
	}

	long long ans = 1;
	set<int>::iterator it = s.begin();
	while(it != s.end()){
		ans *= (*it);
		it++;
	}

	cout<<ans<<endl;

  return 0;
}

C++: ///
// File:  2706.cpp
// Author: ymiyamoto
//
// Created on Sat Dec  2 22:06:52 2017
//

#include <cstdint>
#include <iostream>

using namespace std;

uint32_t gcd(uint32_t p, uint32_t q)
{
  if (q > p) return gcd(q, p);
  if (q == 0)
    return p;
  else
    return gcd(q, p % q);
}

int32_t main()
{
  uint32_t p, q;
  cin >> p >> q;
  uint32_t g = gcd(p, q);

  cout << q / g << endl;

  return 0;
}

C++: #include <iostream>
#include <iomanip>
#include <algorithm>
#include <string>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>

using std::cin;
using std::cout;
using std::endl;
using std::setprecision;
using std::fixed;
using std::pair;
using std::make_pair;
using std::string;
using std::vector;
using std::list;
using std::map;
using std::set;
using std::queue;
using std::priority_queue;
using std::stack;

typedef vector<int> VI;
typedef vector<vector<int> > VII;
typedef vector<string> VS;
typedef pair<int, int> PII;

int gcd (int p, int q) {
    int temp;
    if (q == 0) {
        return p;
    } else {
        temp = p % q;
        p = q;
        q = temp;
        return gcd(p, q);
    }
    return 0;
}

bool prime_check (int number) {
    if (number == 2) {
        return true;
    } else if (number % 2 == 0) {
        return false; 
    }
    for (int i = 3; i * i <= number; i++) {
        if (number % i == 0) {
            return false;
        }
    }
    return true;
}

int main(void) {
    int p;
    int q;
    int ans = 1;
    cin >> p >> q;
    q /= gcd(p, q);
    for (int i = 2; i <= q; i++) {
        if (prime_check(i) == true && q / q != 0) {
            ans *= i;
        }
    }
    cout << ans << endl;
    return 0;
}