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 <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;
    cin >> p >> q;
    q /= gcd(p, q);
    vector<bool> table(1e09, true);
    for (int i = 2; i * i < 1e09; i++) {
        if (table[i] == true) {
            int times = 2;
            while (i * times < 1e09) {
                table[i * times] = false; 
                times++; 
            }
        }
    }

    int ans = 1;
    for (int i = 2; i <= q; i++) {
        if (table[i] == true && q % i == 0) {
            ans *= i;
        }
    }
    cout << ans << endl;
    return 0;
}

C++: #include <iostream>
using namespace std;

int gcd(int a, int b)
{
  return b == 0 ? a : gcd(b,a%b);
}

int main()
{
  int p, q;
  cin >> p >> q;
  q /= gcd(p,q);
  long long int x = 1;
  for(int i = 2; i * i <= q; i++){
    if(q % i == 0){
      x *= i;
      while(q % i == 0) q /= i;
    }
  }
  cout << x * q << endl;
}

C++: #include <algorithm>
#include <cmath>
#include <climits>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <cassert>
#include <functional>

using namespace std;

#define LOG(...) printf(__VA_ARGS__)
//#define LOG(...)
#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define REP(i,n) for(int i=0;i<(int)(n);++i)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())
#define RSORT(c) sort((c).rbegin(),(c).rend())
#define CLR(a) memset((a), 0 ,sizeof(a))

typedef long long ll;
typedef unsigned long long ull;
typedef vector<bool> vb;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vb> vvb;
typedef vector<vi> vvi;
typedef vector<vll> vvll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int dx[] = { -1, 0, 1, 0 }; const int dy[] = { 0, 1, 0, -1 };

struct UnionFind {
	vector<int> v;
	UnionFind(int n) : v(n)  { for (int i = 0; i < n; i++) v[i] = i; }
	int  find(int x)         { return v[x] == x ? x : v[x] = find(v[x]); }
	void unite(int x, int y) { v[find(x)] = find(y); }
};

ll gcd(ll a, ll b) {
	if (a < b)
		swap(a, b);
	while (a%b != 0) {
		a %= b;
		swap(a, b);
	}
	return b;
}

int main() {
	map<int, int> mpii;
	FOR(i, 1, 40000)
		mpii[i*i] = i;
	int p, q;
	cin >> p >> q;
	q /= gcd(p, q);
	set<int> soinsu;
	int copy = q;
	FOR(i,2,sqrt(copy)+1) {
		while (q%i == 0) {
			q /= i;
			soinsu.insert(i);
		}
	}
	soinsu.insert(q);
	ll ans = 1;
	for (int a : soinsu)
		ans *= a;
	cout <<ans << endl;
}

C++: #include <bits/stdc++.h>
using namespace std;
bool prime[10000000];

int main(){

  for(int i=2;i*i<10000000;i++)
    for(int j=2;j<10000000/i&&!prime[i];j++) prime[i*j]=1;

  vector <int> n;
  for(int i=2;i<10000000;i++)if(!prime[i])n.push_back(i);
					      
  int p,q;
  cin>>p>>q;
  int a=__gcd(p,q);
  p/=a,q/=a;

  int ans=1;
  for(int i=0;i<n.size();i++)if(q%n[i]==0)ans*=n[i];
  if(ans==1)ans=q;

  cout << ans<<endl;

  return 0;

}