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<algorithm>
#include<string>
#include<cmath>
#include<vector>
#include<functional>
#include<stack>

using namespace std;

long long solve(long long a, long long b) {
	long long x = max(a, b), y = min(a, b);
	if (x%y == 0)return y;
	else return solve(x%y, y);
}

int main() {
	long long p, q, r, ans;
	vector<long long> prime(100000);
	cin >> p >> q;
	r = solve(p, q);
	p /= r;
	q /= r;
	long long i = 2, j = 0, temp = q;
	while (temp != 1) {
		if (temp%i == 0) {
			temp /= i;
			prime[j]++;
		}
		else {
			if (i == 2)i = 3;
			else {
				double ii;
				ii = i;
				if (ii > pow(temp, 0.5)) {
					j++;
					prime[j]++;
				}
				else i += 2;
			}
			if (prime[j] > 0)j++;
		}
	}
	sort(prime.begin(), prime.begin() + j);
	if (prime[0] == 1);
	else {
		long long k = 2;
		while (prime[0] != 1 && prime[0] >= k) {
			if (prime[0] % k == 0) {
				int all = 1;
				for (int l = 0; l < j; l++) {
					if (prime[l] % k != 0) {
						if (k == 2)k = 3;
						else k += 2;
						all = 0;
						break;
					}
				}
				if (all = 1) {
					long long qq;
					double kk;
					kk = k;
					qq = pow(q, 1 / kk);
					if (q%qq > 0)q=qq+1;
					else q = qq;
					for (int l = 0; l <= j; l++)prime[l] /= k;
				}
			}
			else {
				if (k == 2)k = 3;
				else k += 2;
			}
		}
	}
	cout << q << endl;
	return 0;
}

C++: #include <bits/stdc++.h>
  
using namespace std;
  
#define rep(i,n) REP(i,0,n)
#define REP(i,s,e) for(int i=(s); i<(int)(e); i++)
#define pb push_back
#define all(r) r.begin(),r.end()
#define rall(r) r.rbegin(),r.rend()
#define fi first
#define se second
  
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
 
const int INF = 1e9;
const ll MOD = 1e9 + 7;
double EPS = 1e-8;

#define DEBUG_MODE
#ifdef DEBUG_MODE
#define dump(x) cout << #x << " : " << x << endl
#define LINE cout << "line : " << __LINE__ << endl
#define dumpV(v) cout << #v << " : ["; for(auto& t : v) cout << t << ", "; cout<<"]" << endl;
#define STOP assert(false);
#else
#define dump(x) ;
#define LINE 	;
#define dumpV(v);
#define STOP 	;
#endif

namespace std{
  template<class S,class T>
  ostream &operator <<(ostream& out,const pair<S,T>& a){
    out<<'('<<a.fi<<", "<<a.se<<')';
    return out;
  }
}


int main(){
	ll p, q;
	cin >> p >> q;
	ll g = __gcd(p, q);
	p /= g;
	q /= g;
	ll ans = 1LL;
	for(ll i = 2LL; i * i <= q; i++) {
		if(q % i == 0) {
			ans *= i;
			while(q%i == 0) q /= i;
		}
	}
	ans *= q;
	cout << ans << endl;
	return 0;
}

C++: #include "bits/stdc++.h"

#define REP(i,n) for(ll i=0;i<n;++i)
#define RREP(i,n) for(ll i=n-1;i>=0;--i)
#define FOR(i,m,n) for(ll i=m;i<n;++i)
#define RFOR(i,m,n) for(ll i=n-1;i>=m;--i)
#define ALL(v) (v).begin(),(v).end()
#define PB(a) push_back(a)
#define UNIQUE(v) v.erase(unique(ALL(v)),v.end());
#define DUMP(v) REP(aa, (v).size()) { cout << v[a]; if (a != v.size() - 1)cout << " "; else cout << endl; }
#define INF 1000000001ll
#define MOD 1000000007ll
#define EPS 1e-9

const int dx[8] = { 1,1,0,-1,-1,-1,0,1 };
const int dy[8] = { 0,1,1,1,0,-1,-1,-1 };


using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
ll max(ll a, int b) { return max(a, ll(b)); }
ll max(int a, ll b) { return max(ll(a), b); }
ll min(ll a, int b) { return min(a, ll(b)); }
ll min(int a, ll b) { return min(ll(a), b); }
///(?´????????`)(?´????????`)(?´????????`)(?´????????`)(?´????????`)(?´????????`)///
int gcd(int a, int b) {
	if (!b)return a;
	return gcd(b, a%b);
}
int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	int p, q;
	cin >> p >> q;
	int c = gcd(p, q);
	p /= c; q /= c;
	int i = 2;
	int res = 1;;
	while (q > 1) {
		if (q % i == 0) {
			res *= i;
			while (q%i == 0)q /= i;
		}
		++i;
	}
	cout << res << endl;
	return 0;
}